there are solutions from a Standard Mode View to get a lot of information via the link bar ... incorporating that into JRemote, if possible I admit would be pretty cool, (it have to open a browser up separate from the app, I'd think though). Still would be nice to have for Remotes and Theater Mode too.
You are right that there are no pure standards, but you can set up your tags to emulate big databases that you might like to consult. One of the issues is that english language tags dominate these ... and also handle multiple entries differently (ie. Allmusic uses the slash as a separator JRiver a semi-colon) using Conductor rather than dirigent and having artist and orchestra name be the same and just listing Kirov Orchestra, now called Mariinksy btw, as the Artist helps.
Remember that Roon costs so much because it is leasing you metadata and revamping your inputted tags ... it would not be cheap. I'd be willing to pay a bit per year for it, but not sure how many users would.
I'd be happy to be able to order the tag information panel just to see the tag info I want ... that would be a step in the right direction at least.
I agree though that metadata integration from the web or streaming services is the future for digital audio -- like it or not