I have to admit the one channel on youtube that convinced me to investigate synths in more detail was not one tediously "demonstrating" oscillators and filter settings on a bunch of synths, but one that creates actual music, that allowed me to dream of what I perhaps one day could accomplish if only I work hard enough (and even if I can't accomplish it, the journey is more interesting than reaching the goal). If you look for "marc melia music for prophet 08" in youtube you'll find the videos I'm referring to. Not classical music, but incredibly well done.
I too have been disappointed that there aren't a lot more channels like his, showing off finished compositions.
At the risk of sounding like an old fart: we live in times of instant gratification - buy anything online and it's delivered the next day! ("Free of risk" cause you can send it back if you don't like it.) Post a video/picture online and get instant likes! Binge watch an entire season of your favorite series over the weekend instead of waiting for a next episode every week, etc.
Instant gratification is what makes alcohol, drugs, gambling and social media so addictive, and marketeers are happy to exploit the mechanism for short-term profit.
Evidence seems to suggest this very mechanism is one that on the longer term is undermining the fabric of society leading to rise in populism world-wide, increasing depression, burn-out and suicide rates in young adolescents, and crappy synth demos on youtube.
Here's something I found worth my time touching on these subjects:
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Watch it for some instant gratification and some mid-term agony