Another point: often brewers/breweries have a hard time getting anything in the way of feedback that is both honest and carries some degree of authority that they respect. A small local place with a loyal group of local fans is probably going to get a lot of "yeah you're right, these beers really are the best examples of their style!" feedback. So what other options are there?
-Not medalling at GABF/WBC/etc can be brushed off with all sorts of justifications: too random, so many entries, judges were probably palate shot, BJCP standards don't matter, etc. And there's obviously plenty of truth to all of those, even if they don't actually happen to apply.
-There's no one that really qualifies as a "beer rating expert" the way there are for wine. Well, unless you count The Bros.
-Crowdsourced data is probably the best we've got in spite of all its flaws, so maybe that's why breweries get so worked up over Untappd/BA/RB ratings. A critical mass of hundreds or thousands of reviews from non-local drinkers has plenty of flaws but is better than any alternative I can think of.