Exactly.
My character can call himself "El Gato, the Infiltrator Extraordinaire" if I want. For example, in 3e, whether I build him as Rogue10 or Clr5/Rog5 is a player decision, with pros and cons.
Why exactly does anyone feel that Ftr10, Wiz10, Clr10, and Rog10 should all be equally valid...