The centrifugal gravity approach requires a massive structure - you need something like 200+ meter radius to keep rotation rates low enough that Coriolis effects don't make people nauseous (which would create a whole different toilet problem). Building a better space toilet is orders of magnitude cheaper and lighter than spinning up a habitat.

SpinCalc is a useful simple tool for looking at the tradeoffs of centrifugal artificial gravity: https://www.artificial-gravity.com/sw/SpinCalc/