I'd agree with all of that. That's why I think an entire series, or even an arc, the deals with deliberate attempts to change time would massively exacerbate those problems (although I think it would rule out the deterministic universe). Especially when those efforts are on the scale of a galactic war!The problem with time travel stories is they tend to fall into one of three camps:
- There are no paradoxes, because the future is as set as the past. This is a determinist universe where there is no doubt in the outcome. It can make for an interesting nihilistic premise for a story, but it makes for shit drama or adventure.
- The past/future are mutable, meaning essentially everything can be fixed with time travel, taking all of the potential tension out of any conflict. Problem next season with a bad guy? Just go back in time, and fix it! This is why I think Discovery never elaborated on the Spore Drive's ability to travel through time past Season 1.
- You event some arbitrary rules to limit time travel, which runs the risk of descending into nonsense technobabble (see everything involving the Red Angel).
And how would you defend all of time? It's not just about traveling back in time to affect person X to avoid a specific outcome. You might go back and prevent a species from even starting. Or life from starting on a planet, Or preventing their planet from even forming. Etc. Those go to your last two points.
The latest Discovery actually did pretty good with avoiding paradoxes. Erasing the last loop and minimizing interactions with the crew in the previous loops. Although, Burnham should remember fighting herself.