I would think there would be a mix of suits on the Stations and on missions to Mars or the Moon for the very reasons you mention.

On Mars I can see something like...two zero-prebreath suits in a pressure rover and one for each crew member in the Hab would be possibly logical.

And some sort of "tented" stretcher for medical transport of injured suited crew...
At MDRS they ran a medical injury simulation with an "unconscious" suited person with backpacked on. Putting them on a stretcher to transport was nearly impossible without a specially designed stretcher or removal of the backpack. They put them on their side on the stretcher for transport. If it had been a real injury and the person was suffocation from their tongue falling back in their throat...what would you do? Tilt them head down? Would that work?

Suit geometry will be key to recovery from actual injury. Minor problems here become major ones when you inclosed in a hostile environment.

--Chris Vancil