Its generally not a good idea to call what 99% of people use, "mall ninja" shit.
If you don't like stocks that adjust, that's fine, but don't shit in a thread that is precisely about using a carbine RE and collapsible stock with a rifle gas upper.
Start your own get off-my-lawn thread about how great fixed stocks are and opine to your heart's content.
Then you never tried teaching a class composed of every body type from 5’ 1 1/2” women to 6’8” guys wearing everything from a t-shirt to concealable armor to plate armor. For AR shaped objects we should change the terminology from “collapsible” to saying our stocks identify as “adjustable”.