I suppose it depends on the type of instruction. A quick "how to" on some specific thing such as how to unclog your sink seems easy enough to find on youtube, and I have found these types of videos to be helpful, even if only to generate other ideas on the problem.
It is the videos that purport to teach you some big skill such as playing a musical instrument or some other "hardy" skill that I see as leading folks down a blind alley. I just recently got a guitar coach, rather than a typical teacher since I have been playing for some time already. He was telling me that it is becoming more and more difficult to attract students for his teaching or people such as myself for coaching because youtube promises an easy way to bypass the years it takes to truly learn the skill. So that is where I see a real problem.
As to the OP's complaints, I can see truth in that, definitely. I never understood, whether on youtube or TV, instructional or informational programs needing to have background music at all, much loud enough to compete with the speaker's voice. Also, it can be time consuming to find a youtube video that is suitable for guidance on a particular task. There are so many videos on youtube now, and anybody can post one, regardless of that person's suitability to teach. So what this means is not that there aren't good instructional videos for specific tasks, but that you may have to sort through a lot of "chaff" to find the "wheat".
What I like about youtube is that if I want to do an arrangement of a tune for solo guitar, I can easily find most any original performance, even back to the old tunes from the 1920s. Youtube is an immense library and once you learn how to construct a keyword search, quite handy.
Tony