Things Starfleet needs to fix already on its ships.
What the title says.
I'll start: they really need to put their defensive systems and interface panels on separate circuit breakers. I know this is a design feature ("working as intended") that can trace its roots back to Earth Starfleet, but you'd think by now they could get rid of this legacy feature. How many ensigns have been maimed or killed by exploding panels when the actual ship takes no real damage? An enemy could take out half the crew without even dropping the shields! I could see it as a way to discourage captains from getting into needless combat, but that assumes they actually care about their redshirts; time and time again we have seen that this is not usually the case.
You perceive wrongly. I feel unimaginable happiness wasting time talking with women. I'm that type of human.