Heavily generalizing of course, but: Only in so far as the user actually _can_ make those changes, if deemed necessary or elegant using macro facilities. Once

Heavily generalizing of course, but: Only in so far as the user actually _can_ make those changes, if deemed necessary or elegant using macro facilities. Once something has proven itself good enough to be part of the language standard, there is nothing limiting language maintainers/creators to take it into the standard and ship with next release. So it is strictly more flexible in that way and users do not have to wait on commitees.