Could it be that the reason Starfleet chooses not to use fighters and warships is because of its design philosophy that makes it much more than just a military organization and not because fighters and warships would be ineffective in warfare? I think so.
...Yet we do see fighters swarm ships in combat on a couple of occasions, and learn that they
are utterly ineffective. In "Sacrifice of Angels", they die in droves to no apparent gain, and even in "Preemptive Strike", somewhat larger craft fail to achieve their aims against a single vessel. Heck, three-on-one by Klingon BoPs (one of them potentially larger than the others) fails in "Way of the Warrior" against a single
Galor in a similar fashion; the threshold size for a swarming ship appears to indeed be "half a
Prometheus"!
I agree. To gain an advantage with a multi-vectored attack, we need superior numbers of attackers. Could the Prometheus system be yet another attempt by Starfleet to get the combat results it wanted without deviating from its starship design philosophy that precludes pure fighters and warships? It looks like it to me.
Or then it's simply an attempt at a remotely controlled starship, with a separate remote command trailer pulled to the battle site by the pair of fighting ships, rather than an unreliable onboard AI allowed to do it all on its own?
The technology that might render multi-vector assault mode (and fighters) useless is arcing weapons fire: phasers and photons designed to “outmaneuver” shield arcs.
If you manage to divide the attention of your enemy, it always helps - the more he splits his fire between targets, the less there is per target, on a fixed power budget.
But if you achieve it by dividing your own forces... Not so much. It still seems that a big ship can always fire a meaner death ray than a small one, so you want to minimize the number of ships on your side, not maximize it, in a situation where you have a fixed budget in terms of total tonnage.
Timo Saloniemi