Institutional certainty in the accuracy of feedback is a red flag for cult behavior in organizations.
Very curious where you detect that in GP?
Sounds like a concession to me
The rest of the post is a rebuttal, not 'discounting'
Another possibility is you don't know those things as well as you think. When you say React do you mean React v.16? Does that include webpack, and if so, which version? If you're claiming to be an expert on all those things, it would make me skeptical. I bet you'd have better results if you focused on a few technologies you unambiguously ARE an expert at, and list the other things as footnotes.
Older developers have seen enough technology fads come and go that they are much less likely to do this than a young, excitable one.
A green developer who wants to rewrite everything is $LANGUAGE is just as bad as the self-important greybeard rolling his eyes and scoffing at anything that isn't $OTHER_LANGUAGE.
To be fair, I do try to interview at interesting companies. So, that could be the problem. Maybe, it’s easier in IT or government contractors. But, I’d be pretty depressed.