Cheesing means like manipulating something that has nothing to do with the fight itself. Broken things in the map or connection that people take advantage of. Not killing the ogres in this fight is like not killing the boomers on Crotas end at Crota. You don't kill them because that adds another element to the fight. If you can figure out a way to continue on and survive with them still there, then it's fine. Also, burning down Skolas was not a "cheese" just a specific strategy that used things that were already in the game to just power through a fight.