Don't misread me, I agree with majority of what you are saying but cycling history is in a state of denial!!
Internet and team structure have race fans expecting super young riders to be race ready possibly as teenagers.. Development squads have been part of pro racing for years and teams are pushing young riders to positions of more responsibility each year.
I enjoy Arnaud De Lie style he has a sort of rawness about him. I also find it fantastic that he has not been currently caught up in the excuse tsunami that many riders find as an easy way out, you have riders with serious crashes and conditions that are finding form. And seeing riders like Roglic, Alaphilippe, Remco, Jonas, Bernal, Jay Vine fell and broke his back skull, back racing hard, not talking about or dwelling on the overall effect of injury or illness.
De Lie was diagnosed with Lyme disease and is racing, acting and talking like it's in his distant past!!
So I think it's great for people to have high expectations!! But 22 is not the new 26..if you are around 18,20,22 year olds one conclusion you get almost immediately is that youth almost never equals wisdom ( please read into that as much as you can!!!) De Lie is normal, and finding his way, doing pretty good job of it!!!