My problem with using powders on your shoes is two-fold:
1) There is no way to guarantee, even if you are dilligent about using a wire brush and wiping things off with your hand, that you are getting all of the powder off. I mean, I watched the bowling alley staff wipe down and clean the approaches before we bowled, but the stuff was still engrained into the surface. Therefore, even if you're careful, you are still most likely transferring at least a little bit of the powder onto the approach. That brings me to my second problem:
2) Why should everyone else on your pair and those who bowl later have to adjust their games for what you are doing, especially when there are other ways to achieve slide? I don't remember who said it, but one poster said "practice what you preach and learn to adjust." Why should your slide problems cause seven or eight other people to change their games? If I am sliding too much, I change to a sole that slides more. If I'm sliding too little, I try a sole that will slide more. In either case, nothing that I'm doing will mess with your game. So why should your slide problems mess with mine?
To me, it's just a matter of courtesy. If you're having trouble sliding, buy different shoes (SSTs, Tour Ultras, etc) or invest in some sort of slide sock. That way, you can play your game, and the rest of us can play ours.
I didn't mean to throw everyone who uses eazy-slide or baby powder under the bus. I'm sure some of you do your best to use it in a responsible manner. Still, I think that the good of the masses should outweigh the good of one, and the stuff just shouldn't be used.
--------------------
I've only bowled 300, but I've benched 345
http://members.bowl.com/FindAMember/memberView.aspx?mp=519&ms=9130&s=2006-2007