What a surprise. The thing you already "knew" prior to investigation turned out to be "true".
I disagree with you on all points.
And intellect devourers and dragon-riding githyanki are not "fringe" lore. They go back a long, long way, and have been featured in many products, adventures, and video games.
They worked very hard, and they are still working very hard, to make a great new Baldur's Gate game for a 2020 audience. You suggesting, no, outright asserting, that they didn't try even "a little bit" is just insulting.
