I've never done BIAB, and don't plan to, but I've never felt it was any less "brewing" than using three vessels. But some ****** will always take issue with someone NOT doing things the way they do it. BIAB brewers can be just as guilty of this as anyone else.
A buddy of mine is just getting into homebrewing, and loves my 2-tier three vessel system with a pump. I suggested he check out BIAB first because he already has a 7 gallon pot, a burner and a chiller.
Some of the $hit I've been pilloried for here on HBT:
I fly sparge, and have for 15 years. I like it, it works for me, leave it alone, batch spargers
I immersion chill. Don't want a plate chiller, I like to leave all the break material behind in my kettle, and the immersion chiller takes 10 seconds to clean.
I bottle. I kegged at one time, but didn't like it, sold it all off, have no plans to go back. But I wish I still had 4 of my cornies back for lagering...
I use a temperature controlled fermentation chamber (two, actually). Someone in the "I make great beer at room temperature" crowd eventually takes issue.
I use glass carboys. OMG, I'm surely going to DIE from doing this. In 18 years, I haven't broken one...yet.
Recently I got flack for pointing out that there was a price difference between using StarSan and Vodka in an airlock. Really?
The point is, someone is always going to try to pi$$ in your Cheerios. Sometimes you just have to let it go and scroll down.