I agree with the latter point but not the former. Many, many YouTube videos on many, many subjects are sufficiently in-depth. I remodeled my garage and built my home office in it largely with knowledge I learned from builders and tradesmen on YouTube. Practices like drywalling, installing and leveling doors, sealing concrete, changing light switches and receptacles, and doing trimwork are some of the things that I knew nothing about and then learned how to do well enough for me to WFH at the start of the pandemic.
In the world of music, and especially hip hop, production and mastering YouTube is perhaps the best school on the planet. The amount of knowledge being uploaded and viewed daily is absolutely a world wonder.
And while YouTube authors and creators aren't able to give critical feedback directly from their channels, usually, some do[1][2][3]... and even if they didn't, it's not like there is a shortage of places on the internet to get critique on your art.
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1. Deadmau5 reviewing a track submission: https://www.youtube.com/watch?v=JY76tO4qe8Q
2. Well-known hip hop producer Kenny Beats holds beat battles on his Twitch, this video is from a contestant who regularly enters the contests: https://www.youtube.com/watch?v=djLT5OQbHpw
3. Music reviewer Anthony Fantano routinely does amateur track reviews with his fans and followers on Twitch, live: https://twitter.com/theneedledrop/status/1405171034538582017 (Sorry, no VODs on his Twitch that I can see... which is common for music-centric channels unfortunately)
In fact I'll go as far as to say a requirement for masters to teach students is an inhibitor to widespread learning and the invention of the printing press is what allowed us to avoid this. Similar to the revolution that the internet is creating.
Nothing from what I learned in Uni prepared me to actually be a software engineer, yet here I am (as well as most of us who are reading this, I assume).
The world's progress doesn't depend on a few exceptional people, but it does require a competent majority.
When I think of an artistic renaissance (lower-case), I think of emerging from a fallow period into a new, productive, innovative period. The article makes the case that this is what happened in Argentina as a result of these netbooks. I can't say if that's true or not, but the word choice is reasonable to me.
Autocorrect.
And while I am unaware of the music scene of YT, you can get access to world-class tutorials in CS topics- from MIT, Stanford, etc. They are as good as any.
And, yes, critical feedback is very important, but while you cannot properly substitute the feedback you get at unis, you can learn to live with and benefit from internet forums, groups, subreddits, etc.