I am surely against "crippling."
The initial topic of the discussion was how to make Emacs accessible to the new users. I don't suggest making fixed changes to anything, only allowing somebody to easily select different defaults which correspond with the keyboards available today. Today's keyboard has no meta key. Old keyboards didn't have a lot of keys that today's exist and have expected behavior in GUI -- potential Emacs user should have a possibility to turn on "consistent" behavior for everything that can be consistent, and the help should be easy to read without having to divine what META key in the "easy" case could even mean.
Of course the old users should be able to use old behavior.