I could see an argument that FTL merely requires some different or undiscovered physics, or for something vaguely plausible but not likely to actually work out like the alcubierre drive (funnily enough not too dissimilar from warp drive even) to prove actually doable, but an economic system that seems incompatible with human nature requires the species as a whole to be different, which they arent really stated to be in trek. Of course the system star trek has honestly probably isnt that incompatible anyway, with a high enough population (and a star empire should have an absolutely huge one) and lots of automation, even if a tiny fraction are willing to do high risk exploration or military esque work just out of some sense of duty, that tiny fraction is still a ton of people.