NuTrek screws with this concept to such a degree for the sake of plot contrivance that you have to give up trying to explain it. If it is possible to transport a living being over several light years safely onto a ship at warp or another solar system, it would be child's play to cripple or destroy a ship as long as you have detected it on your sensors. Just beam away chunks of it before it can react or beam out as many life forms as you can detect and keep your new shiny ship for yourself.
That's one of those things that only SOUNDS easy. In actual practice it probably wouldn't be.
Transwarp beaming has a lot of potential as a sabotage/assassination weapon, used on a very small scale, under ideal circumstances with a lot of intelligence overhead and premeditation. Somewhere in the Abramsverse, if you dig deep enough you will probably find at least one instance of Section 31 or the Tal Shiar using a transwarp beaming device to snuff out some uppity Klingon general and make it look like an accident. It's an interesting kind of trick, but it's hardly a silver bullet.
Of course, this would lead to an arms race whereby all ships have shields up all of the time
I'm not convinced they don't. Starships run with navigational deflectors as standard practice, and space is full of cosmic rays and charged particles that are difficult to shield against effectively.
It seems to me that the ubiquity of basic navigational shielding is one of the reasons transporters prefer to beam people from one transporter device to another; that's just easier and safer with all other things interfering. Sophisticated Starfleet transporters probably have some kind of ECCM devices that can penetrate low-level shielding nine times out of ten, but high-level shielding is either too hard to penetrate or too dangerous to try.
They should have placed very restrictive limitations on transporter use very early on so that communicators or some other form of local pattern enhancer is needed to beam anything up from a remote location.
Which is another thing I liked about the Abramsverse transporters. They depict the beaming process as a lot less "push the energize button and there he is" and a lot more "Have to keep the transporter beam perfectly focussed on that target for like eight seconds or nothing much will happen." Apparently all the various tricks for increasing transporter's efficacy -- including transwarp beaming -- are really just complicated mathematical algorithms that make targeting easier.
One silly thing in NuTrek was the notion that a small team could infiltrate the Narada when in fact the Narada's internal sensors should pick up the intrusion and they could raise shields while deactivating the drill long enough either to beam an overwhelming security force to the exact location or just beam the intruders straight to the brig.
First of all, "internal sensors" in this context basically means surveillance cameras and intrusion alarms on hatches and consoles. Narada is a mining vessel, so its internal security is probably geared around preventing theft and keeping the crew from accessing materials without authorization. OTOH, Starfleet's "internal sensors" aren't much better, so Narada's security seems pretty standard (if you think about this, modern Naval vessels operate more or less the same way; security isn't monitoring the ship's internal spaces,
just its equipment).
Second of all, again, Narada is a mining ship; it's crewed by a bunch of Romulan factory workers who are NOT, in fact, ninjas. There are probably two or three people on the entire ship who are actually trained to operate a transporter system, and they only have civilian training; the rest of the crew probably knows as much about transporter operations as YOU do.
This assumes, of course, that the Narada actually HAS a working transporter system. This isn't known for sure.
I see no point in using transporters as a weapon, unless you have a lot of energy to burn, and wanted to torture and kill someone horribly. In which case, you have a number of options open to you that will make your prisoners wished you simply destroyed your ship.
Beam warhead into ship, done. That's all it takes, Voyager even did it in an episode where they accidentally destroy a Borg scout ship, having intended to merely disable the ship. The only issue is shields, but that is not a real issue.
It kind of IS an issue since nine times out of ten you have to take the enemy's shields down before you can beam anything onto his ship. Strictly speaking, if you've managed to get into transporter range and your intended target still hasn't raised his shields, it's usually easier to just phaser him to death.
The Borg are the exception to this rule because they don't bother with shields. Under normal circumstances, even beaming a warhead onto their ship wouldn't make a difference because they would just regenerate and come after you again. Even Voyager's destruction of the Borg probe was an ACCIDENT; the point of beaming the torpedo was to hit them at a critical spot that couldn't be targeted accurately from outside the ship.
On some level, this is basically a simplified boarding action, which starships already do.
The
folded-space transporters in TNG were completely unstoppable by shields, though the system eventually proved traceable, allowing its use to be stopped only by a counter attack. Their only weakness is they cause cellular degeneration on a genetic level, which is a non-issue in transporting munitions to a target. The whole device was a 4 m x 1 m column, and could cause multiple transporter rifts in rapid succession.
Good potential for a terrorist weapon. Probably expensive. And in the Federation, also probably illegal.
If folded-space bombs were standard weapons, the designs of starships would have to be radically altered
Or they could just come up with a countermeasure that would nullify the advantage of space-fold bombs. Like they did when photon torpeodes and phasers were invented.
It's a small step toward imagining every bomb having its own folded-space transporter rather than relying on a centralized system.
That's another silver bullet solution, though. It's an interesting trick you can use if your enemy hasn't seen it before and hasn't come up with a defense. The thing is, if the technology for the space-fold transporter is so simple that a pissed off Ferengi can buy it on the black market, the countermeasure probably isn't that complicated either.
And the 20bn credits you just spent retrofitting all of your starships for the new golden age of space fold bombs? Ooops.