well,experienced players can play well with different AR's ,I think.
Maybe mappers just should use different AR's only in "Hard" and "Insane" difficulty,because this will be hard to play for newbies in 'Easy' or in 'Normal' with different AR's. Or mappers should use different AR's on all diffs : newbies can adapt to this - this won't take a lot of time!
The second option sounds much better to me. So,I think it's good.
Maybe mappers just should use different AR's only in "Hard" and "Insane" difficulty,because this will be hard to play for newbies in 'Easy' or in 'Normal' with different AR's. Or mappers should use different AR's on all diffs : newbies can adapt to this - this won't take a lot of time!
The second option sounds much better to me. So,I think it's good.