Who among you lovely folks remembers Golden Wyvern Adept?
See, following from Bo9S (the same product where D&D players first learned that outright lies and comparison to D&D's unrequited crushes like anime and vidja games could sway people against good products), WotC previewed the new edition with a feat for wand casters that had flavor referencing an organization of wand-based casters; the Golden Wyvern School.
The wonderful folks who are now champions of D&D flavor obviously loved this and... no wait, they ripped it to shreds. They filled several 50+ pages threads on how this was the worst thing to ever happen to D&D and how WotC should NEVER put flavor text into rules. They demanded WotC learn this lesson and never do this again.
Then WotC published clean rules with flavor text in the italics or in the headers for Races and Classes.
At which point, those guys collectively shouted 'GOTCHA!' and pounced on them, tearing them to shreds for not having feats just chock full of flavor text.