Regarding wheels, most makers have a similar sweet spot of a wheel that's efficient given the bag size and intended use. Spinner wheels ime are not tiny precious things anymore and are built well enough in most cases for decent enough use across all urban terrain. The idea that spinner wheels "waste space" is very subjective because how much space available to you in any given bag is largely a function of one's packing skills and the design of the bag. So whether a given individual would have an issue traveling with a spinner comes mostly down to variances among people and not any objective measure.

The point of my earlier post still holds, that people should choose bags based on their individual preferences and needs and that there is no longer any single "best" or optimal solution to the "which type of bag should one buy" problem anymore. The answer now is entirely driven by user needs & preferences and bag design - i.e. can the user effectively pack and carry the bag.