You don't get it. Your 400sqft apartment needs to be shrunk by a factor of 6 to have the same area as the Orion. Try living in an 8x8 foot square for a couple weeks.
Not in a storm you can't! Granted I didn't do ten days. But I was with two other people for close to a week and it was...fine. We're old friends. There were moments it got annoying. But it was never boring or restrictive. We just played games, drank, looked out of the portholes, cursed hangovers and talked the one person who occasionally wanted to call it.
I’m 6’, so that’s the usable volume. (I’m not claustrophobic heighwise.)
I honestly don’t see an issue spending a couple days with folks I respect and admire in close quarters for ten days.