Remathilis
Legend
Perhaps the answer is just work around the RC limitations. For instance, thieves become an NPC henchman class, hired as the party's "burglar". Demihuman PCs who reach the limit retire, and the player then runs a new human PC of the appropriate level who has heard of the party's fame and exploits, and seeks to join them now there's a vacancy. By that level you're probably looking for a change, and for some reason the idea of demihumans retiring seems to "fit" (perhaps LotR is to blame for this impression).
Would that keep it from bothering you? It bothers me too, but the above workarounds seem to make the RC viable again. And as jdrakeh points out, you need the D&D RC branding to get players.
Oh, I could easily work around the issues in the RC if I wanted to (many of the problems are less egregious in RC than in 1e or 2e) esp with some optional rules found IN the RC (for removing demi-human level limits) and out (going with a more lenient version of thief skills, limiting magic that breaks the thief class).
Perhaps some time in the future I'd organize an old-school RC D&D game. Perhaps...