We all know the pictures of the astronauts on the ISS floating around. We also suspect that a lack of gravity is bad for the body as the muscles go weak and such.
Why don’t spaceships just rotate to cause the effect of artificial gravity through centrifugal forces?
on point 3, long distance communication invariably uses highly directional antennas, which means these need to be aimed precisely, which means special automated gimballed antenna set that would drop signal anyway probably
also you definitely don’t want to deal with rotating gas seal that is also under pressure and fail-deadly, these already wear out quickly with sporadic use on earth. if there are two sections, one spinning and one not, both would have to be sealed