[Bloody Sam Roberts]

when are they going to make a “wheel” shaped spacecraft so they can artificially create at least SOME gravity

Likely right after someone invents a frictionless material for the huge bearings that will be needed at the hub of such a "wheel".

[drbuzzard]

There’s always magnetic bearings if that is your concern. I think it more likely engineering issues of being able to maneuver something which is a giant gyroscope and doesn’t want to turn.

[Mr. K]

why make the hub stationary?
let the whole thing rotate

[Covenantor]

when are they going to make a “wheel” shaped spacecraft so they can artificially create at least SOME gravity

Likely right after someone invents a frictionless material for the huge bearings that will be needed at the hub of such a "wheel".

Are you assuming the need for non rotatating center core? What need is there for that? Given a slow rim speed, a fixed central core would barely register as moving, no?