>>8122931there's a campaign mode where you have to unlock them which i like since it gives more reason to do stuff than just for shits and giggles while also forcing you to figure out what parts are good for without being overwhelmed by options
of course the downside is you get locked out of doing stuff for a while since you can't exactly go to the moon with a couple of boosters, but there's a decent curve on that sorta stuff for the most part