I guess storing my music in my PC hard drive and playing from it makes me look like a caveman.
It's certainly an option, but it lacks the flexibility most people have come to expect. Storing your media locally is fine, but you only have it when you're physically at your machine. To go portable you have to manage syncing files to an external device. Now you've got two libraries to manage. Yes, we lived with this kind of thing since digital music existed, but it was a pain then and it's a pain now. Keeping one c…
Just copying whatever music I want to listen to on the go and playing it back locally is far simpler and easier than dealing with Plex/Jellyfin, hosting a server, managing a VPN, and all the other sysadmin nonsense.