a good suggestion to find alternates for field based moves that aren't too good for battles (who likes to replace slash with a cut :Ambivalent: ). this way we can keep our 'real pokemon team' always on hand and ready for battle anytime instead of keeping low lvl pokes just for using hm moves.
Also if anyone think this is a major change in game mechanics, think of how fly is not usable in pro (i would call that a major change in mechanics).