Yeah that doesn't apply to every brewery. My wife works for a micro brewery (3 barrel system). They have 22 taps and constantly rotating out new beers and flavor combos. I'm often there helping to brew (and scoop out the spent grain which we feed to our spoiled chickens). MOST of the time they're using high grade amoretti brand flavoring (although they do add other stuff like fresh fruits or spices and cakes where appropriate).

But since they're not producing high volume, they are constantly rotating out flavors and styles of beers. Almost every other week there's something new on tap.

Fruited beers are very popular and breweries make them sincerely and routinely, especially for sours and milkshake-style ipas that tend to be the big hits with young people that don't have a taste for more "serious"/traditional beers. This is the beer for Basics and is the bread and butter of the local nano and microbrewery to draw in diverse crowds. They also change up their selection to drum up continuing interest.

If there is any brewery that tries to recover infected batches by masking the flavor the Brewery deserves to be ridiculed and shut down. I spent over a decade as a craft beer buyer for a large place that dealt with literal scores of microbreweries and have never even heard a sniff of a rumor about a good brewery doing that shit, and I think you should name and shame the one you worked for the did.

(the shit you said about Brett is also utter nonsense; brett beers are intentionally pursued by a lot of very creative breweries. They get especially goaty and fun when cellar aged)