+1 on tailscale. It’s really easy to set up, and that’s exactly how I’m connecting my phone to navidrome in my home lab.

Only issues I ran into were to turn off tailscale DNS because it was messing with my phone’s general Internet connection while away from home.

It’s getting there. They’ve been taking a progressive improvement route. Searches sometimes work, mbid searches more so. They are building a cache/index of some sort, so it’s taking time for that to populate, and it’ll have a higher success rate as the progresses.

I think you make a mistake of thinking that our collective body of knowledge is exhaustive. We discover new things all the time. Until we know everything (i.e. never), there will be gaps that AI will not be able to accommodate.