Yeah, leg day gets a lot harder when you're floating. Not to mention they're missing all the normal walking around and lifting gravity forces us to do...
The last update I heard (granted that was weeks ago now) was that the capsule was faulty but still perfectly functional for reentry. They just wanted to do more testing first since reentry would also destroy their opportunity to learn more about what's wrong.
Its apparently still entirely functional for emergency reentry.
Not spinning is better for repairability. If we do a manned mission to Io on Jupiter it starts to make a lot of sense since there is so much less debris in space further away from earth so repairs are less frequent.