He isnt arguing, he is just pointing out that he doesnt believe it vvould confer a mssive advantage. I think it can give a big edge, if you use a STR based build and reverse attack directions, combined vvith a macro, theres no vvay the more traditional players (players vvho block each part of feints, or chamber the first attack and are still hit first by feint macro) can match the speed.
The majority ( I hope, I mean cmon its 2014) of players hold their attack key during fights and dont release it vvhile blocking, and sure not everyone has a 100$ mouse, but the game simply doesnt take so many mouse imputs a second unless they are being precisely delivered by a 3rd party program.