i also think alot of education and engineering youtube fell off. Kurzgesagt lost most of its charm. mark rober is now discount Mr. beast. Tom Scott is enjoying retirement, and veritasium... i dont really trust anymore. he has a few incredible videos but sometimes is far too confident posting somewhat iffy science.
on the engineering side, Real engineering feels too much like ads for random companies, William ozman is acitve on his second channel fucking around on a farm, idk what Nile Red is doing, and i think michael reeves is now 90 percent streamer