Everything you guys are saying about the spore drive and other technologies when it was a more episodic series is right, but it just personally bothers me that they keep using it as an ongoing thread. I had no problem with it being a story line but the continued use in a prequel for two years makes me scratch my head every time it shows up
It's just a matter of degree to me. As I said, they've been building in reasons from the start why it would be a bad idea to keep using the technology. By now they've piled on five or six different reasons for abandoning it, which in my mind is enough to cancel out the continued use in the short term.
As for the "ongoing thread" aspect, that's just because DSC is a serialized show instead of an episodic one. It's still essentially telling just one big story per season, so it's kind of the equivalent of using the tech in just one episode.
Besides, how many years do you suppose were spent developing Genesis or the soliton wave drive before it was abandoned? Just because we only saw the end of the process onscreen doesn't mean it didn't go on longer.
I have a much bigger problem with the portrayal of Section 31 as a widely known entity. I can buy something being abandoned; it's harder to buy that people forgot it ever existed in the first place.
And it makes warp drive, a major plot point in all of Star Trek obsolete basically. It's big enough that I think a reasonable person would think they could eventually make it 'safe to use'.
It has the potential to destroy the entire multiverse. I don't think any sane civilization would be willing to risk that. There's probably some kind of test ban treaty like for polaric ion power. (The same probably explains why Genesis was abandoned.)
I think the difference is the spore drive is used over and over again. With Genesis it was used once, the protomatter was revealed as a fatal flaw and it was never used again. You can infer that it was never used again because protomatter was required to make it work, making it unsafe. Even David in TSFS said "Genesis doesn't work..." If I remember correctly I think John Vornholt even went into that a bit with his Genesis Wave books. In a way, I think they rationalized why Genesis was a failed project pretty well. Protomatter, David saying it doesn't work...and then best of all the planetoid basically falls apart.
I actually find that much harder to buy as an explanation. As you say, in real life, people don't abandon a technology completely just because its first version is dangerously flawed; they find a way to make it safer. (Besides, what the hell is "protomatter" anyway? It's just a nonsense word, a particularly dumb bit of empty technobabble. It's always annoyed me.)
Heck, even if the protomatter thing explains why Genesis wasn't developed as a terraforming tool, it doesn't begin to explain why nobody pursued it as a weapon. That's what Kruge wanted it for, after all -- a way to develop planet-killer weapons. If that's your priority, then
Genesis still works. So that doesn't explain why it was abandoned. Hence my thinking that there must've been some kind of treaty ban on researching it.