... the worst case tolerance stackup of NEW wheels...
I've seen provisions like that in mass-production factory settings.
Sometimes cheaper to have the assemblers do an added step (the *tweak* or *fudge* factor), than to implement tighter tolerances on all the individual parts.
..Best bet when using a spacer... is having the correct spacing...
Absolute ditto.
Fine tuning factory fitments also works well in gunsmithing...