The following is just a story:
I have been putting apple juice into a carboy and then adding dry yeast.. sometimes I add dextrose sugar. This comes out as hard cider and it is spectacular. My friend has been been brewing for 15 years and has a 31 gallon system with 2 pumps and kettle that is heated by steam. He calculates yeast populations with a microscope. He makes some good beer but it isnt any better than my hard cider. He tries to say he is a better brewer... but I beg to differ as my product is equal to his. Actually most of our friends prefer the cider - So maybe I am the better brewer.
How many competitions has he won, and how many have you won? My friends like my beer, sure, but the proof of an actual "good" beer or cider is by impartial experienced judges.
I think that many brewers have what I've called "ugly baby syndrome". You know what I mean- parents have this hideously ugly child but think he/she is the most beautiful baby ever born. Brewers are sometimes that way- they don't taste astringency, esters, phenols, etc in their own beers because they are their ugly babies.
So, for me to say, "I ferment at 85 degrees and my beer is awesome" (as an example) doesn't mean all that much unless I show you the medals I won with it.
But, here's the thing- if I love my beer, even if I suffer from UBS, and I love the brewing process I have- then it's exactly the right process for me.
I've had some awesome beers come out of BIAB brewer's set ups, and I've had some terrible beers sent to me by traditional three vessel brewers. Unless they are actually looking for honest feedback, what I think doesn't matter a bit.
I think BIAB in a pot is as valid a brewing technique as my 'fancy' all electric HERMS. If some electric controls make a brew session more dependable and reliable for a BIAB brewer, and they want to do it, then it's the correct thing to do.
My single tier takes up quite a bit of room, and can be a pain to clean. There are advantages to simplifying for sure!