Retractable helmets are a niche design, they sacrifice protection for being able to store and carry them in a more compact form,
having to carry around a full helmet everywhere is a pita, but on a space ship, especially one that can come under surprise attack at any time, having a helmet at hand ready to put on can be the difference between life and death.
Go ahead, carry a full motorcycle helmet around for an entire day, having it always attached to your person, preform all your daily public errands with it, buy groceries with it, cook with it, tell me it isn't annoying, inconvenient, and a colossal pita. Now imagine everyone on a cramped starship has to also carry one around with them,
In game everyone has to carry a helmet with them where they are going, so the sacrifice of maximum protection in order to actually be able to carry it easily for emergency situations makes sense. If you know you will need a helmet that provides max protection then you can prepare one separately.
Having a basic helmet that can save you if you get spaced and does not interfere with your tasks is more important than a helmet that can withstand a nuke but is the size of a beach ball.