Yeah I refused to be "migrated" (forced) to join YT music, where it was clear that my personal library of songs would be treated as a second class citizen next to the paid promotional content (suggested artists, songs etc) and ads (unless I pay for premium of course).

Felt like bait and switch to me. They forced me to make a decision. I took my ball and went home.

the functionality to host your own music?? is that on YT Music?

Personal uploads work just as well as before, IMO

It was there, just buried. Equivalent of uploading all your songs to YT and listening to them there. Screw that, I wouldn't call it "hosting".