The big issue is that physical media degrades. A cassette tape wont sound the same as it did after just existing for 20 years. CD’s and Vinyl records if kept really well can last for 100 years or so but are delicate in other ways and a bad record player can cause permanent damage.
Preserving the experiences of others, art, media is important, but at the end of the day nothing we do is permanent. I know that thanks to online archives I can go and find old music if I need to. I am glad some folks preserve hard copies but a preserved collection isn’t really a functional one and a functional one isn’t really going to last 50 or 60 years at the same quality as what you can get from streaming.
We all have happiness, it’s just hard to see it past all the other stuff we got going on in our heads.