There was a good run of Computer Chronicles, TechTV, and G4 for a while there. These days, This Week in Tech still exists in podcast form. G4 had a short revival as G4TV a few years back. There's nothing nearly as popular these days, but there's still lots of good ones like Waveform, SomeGadgetGuy, and AwesomeCast.
The Computer Chronicles was kind of unique that way.
Edit: OTOH I just saw a 55 minute well-produced youtube video on ASML's EUV photolithography machine that fulfilled all of that. I had some bias against this channel for some reason I don't remember, but anyway: https://www.youtube.com/watch?v=MiUHjLxm3V0.
They have enough of a following now that they can dedicate 55 minutes to something and not worry about the algorithm, which usually dictates much shorter form factors
I really enjoyed the segments where they let ASML's (now former) CTO Martin van den Brink just talk.
YouTube has a few quality channels but they tend to fit into a particular niche. The bigger names are just lowest common denominator slop like LinusTechTips.