I do all of my fermentation in kegs, cornie kegs, and since doing so have brewed my cleanest and best tasting beers. People here are successfully using sanke and cornies to ferment in and doing it quite well.
My own opinion...just because a couple guys say you can't/shouldn't do something, doesn't mean that it can't be done, and done well.
One set of opinions does NOT trump many successful batches of good beer.
Schöne Blondine Brauerei
Closed-System Pressurized Fermentation - the future of homebrewing today...!!!
“Simplicity is the ultimate sophistication” – Leonardo da Vinci
"A set back is the opportunity to begin again more intelligently" - Henry Ford