this is great post! there's a reason that i only mentioned a few videos in my post on the game development articles and resources that helped me, all of which were from experienced developers and almost all of which were completely unedited.
you can learn so much more about making games from mentors and other experienced non-influencer game developers talking about things that they have made themselves than you can from people who spend lots of their time scripting and editing videos, no matter how good those people are at telling you that a popular nintendo game is a masterpiece or that they'll totally release a great game of their own one day. you also learn a lot from making games and studying other games and talking to gamedev friends, of course! but there's no educational benefit from gamedev youtuber/influencer content in my personal experience.
Mmm, that is a tragic final conclusion as an experienced game dev trying to find a line of self-expression between all of those things and picking fun video editing because it makes me happy to do in my free time.
But I think there are a few notable YouTubers with valuable things to say alongside expressing themselves in a audio-visual medium in creative ways (I think New Frame Plus is easily in the top echelon of this), but like any major platform these days, it takes effort to find them. I similarly see TikTok considered invalid by a lot of creative folks in my generation, but there are so many brilliant artists and creators I'd never have come across without it.
All that said, yeah, most devs with meaningful experience don't have time for making well-edited YouTube content. I'm gonna try writing for www.gamedesignskills.com soon because it seems like it has a lot of potential for curated real industry experience (I at least want the sort of thing it's trying to do to succeed because I've seen nothing try as hard), and I'm finding some of the more engaging stuff I've read just coming across blogs of seasoned designers. But even on that side of things, a lot of the best designers in the AAA industry simply do not have the time, energy, or even personal propensity to post their knowledge online. This all goes deeper, too, with issues covered on this blog below from Daniel Klein (former Riot, Respawn), he's exasperated about this very issue in game design education programs, where the problem is honestly worse than YouTube (if only because of how much students are paying for tuition). I can validate firsthand how little true game design knowledge was even conferred by the degree I got, but it sure got me a job.