“Centering” can apply to a wide variety of issues on a bike. Brakes are centered. Wheel in the dropouts have to be centered. The rider is centered both right and left as well as back and front. “Centering” could lead to confusion. The only thing I’ve ever heard referred to as “dish” is with regards to wheels. Saying “centering of the rim” is rather uneconomical in terms of word usage. I suspect that 90% of the cycling public would look at you with a blank stare if you called dishing a wheel by that string of words. Granted the vast majority of people have no idea what “dishing” is anyway.

You lost me. I’ve not a clue of what you are trying to say.