Space legs will be a simple failure given the current limitations on things to do. The game world needs to be massively fleshed out before space legs will give you anything apart from being able to wander around your ship.
Which after the first couple of times you won't do 'cos it boring and nothing to do.'
This is sort of the problem with the entire game.
Want to be a bounty hunter? Spend some time in a RES or CZ and realize that there's nothing to do other than blow up potato NPCs.
Want to be a trader? Spend some time hauling A-B-A trade routes, which you probably needed Thrudd's Trading Tool to find in the first place, then get bored.
Want to be an explorer? Jump/scoop/honk, repeat 1000's times and sift through similar RNG-derived systems to finally find an Earth-like, and hope someone didn't already claim it.
Want to be a pirate? Don't bother. Seriously, just don't.
Want to be a miner? Again, don't bother.
Want to work the BGS or Power Play? Same answer.
Want to play multicrew with other players? Hope you enjoy flying an SLF and don't plan on doing anything together that requires an SRV.
Not making space legs because there will be "nothing to do" means that they might as well abandon the entire game for lack of meaningful content and activities.