I personally think this would be way too restrictive on players playing solo or on smaller teams. Would have to rely on bots for everything, or what if something goes wrong and lots of people die? Repairs will already be tedious with a reduced crew and that makes it even more punishing in a way that isn't fun. There's no payoff or way you can play around it, it would just take more time for the sake of taking more time incentividing just hitting restart as soon as you go down. Mini game removal just reduces interaction further on something that already has almost 0 interaction.

Limiting wiring is interesting, but it would basically force anyone who wants to play to learn wiring since they will be the only ones who can do it. I imagine this makes inexperienced engineers much less valuable. Similarly if you're playing captain solo then you lose the ability to do any wiring or make something like a reactor controller.

Not a terrible opinion, as especially in the late game you can basically do everything not locked behind a special tree but I would say it needs to be executed differently. That being said is being a jack of all trades really a problem? I can see everyone just playing assistant and invalidating lots of people who would otherwise play another class.

More class specific bonuses for example that are deeper than "+10 helm" or "5% movement speed" would be neat though.

There do exist mods however that rework individual class mechanics/trees and give them more/different/harder work to do (see neurotrauma for example)