@tripleCrotchet
thanks a lot for providing these examples. I can share my Otello if you like… 
I had set Roon to “prefer file” for everything. Normally I would have tagged only Herbert von Karajan as the ALBUMARTIST on this recording but for comparison I have added the Wiener Philharmoniker just like you did:
One of the first things I had learned from @joel was that I’d best leave the ARTIST tag blank - and that’s what I did. But like you I don’t get a hyperlink for the Wiener Philharmoniker. In general my guess is that the first line below the album title comes from your ALBUMARTIST tag whereas the second line comes from Roons metadata.
Here I observe two things:
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Roon seems to combine the album artist tags with its own metadata and tries to avoid duplication, so Karajan is displayed only once. However, as you pointed out, the Wiener Philharmoniker are not automatically recognized as Vienna Philharmonic, although Roon seems to know these names as usable synonyms. (I’ll discuss the language preference later
)
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Although I had preferred file over Roon globally, the box for the album artist is checked for Roon (I had reported this in another thread and I believe it is being investigated)
But now comes the part I still do not understand completely: why do I even get Mario del Monaco, Aldo Protti, Renata Tebaldi and Renata Scotto displayed as Album artists when I told Roon to “prefer file”. My understanding would be that Roon would try to match those artists my files tags provide with its own database. So where do these Artists come from?
As far as my metadata is concerned, I have maintained the following:
So Aldo Protti, Mario del Monaco and Renata Tebaldi could come from my tags, but Renata Scotto not. So at least Scotto comes from external metadata (probably the others as well and my SOLOISTS are probably just ignored, since the album was identified). I initially thought Renata Scotto would appear via the credits, but no…
So how are things really working? I have no clue…and I’m just wildly guessing, since I did not find any documentation on the metadata determination logic in detail.
And I have no real control. I understand that this is just the way Roon works, but even if I repeat myself - I honestly find this approach questionable.
Once you let Roon identify an album you seem to have no complete control over what’ll happen - you are playing metadata roulette, literally. So in this case, metadata quality kind of decreases for me, even if lots of additional metadata is added.
Next thing that I just find not to be correct is the handling of “additional” conductors:

this is just nonsense in my opinion - this recording is not conducted by Karajan and Benaglio. Benaglio is the chorus master, He prepared the chorus for the recording who was conducted by Karajan. I see this a lot and it annoys me terribly.
It’s nice to have all those credits for the chorus masters, but they are close to 100% never the conductors of the performance. In order to have my desired metadata (Karajan as the only conductor) I need to manually delete Benaglio from the credits. It’s like the “composers” for Elgars Sea Pictures that Tony reported.
Finally, coming back to the Wiener Philharmomniker / Vienna Philharmonic dispute. I think Roon needs to find a smarter way of managing those synonyms and being a german myself I’d prefer to have Wiener Philharmoniker as the main name, of course.,
Reading Dresden Staatskapelle instead of the correct term Staatskapelle Dresden just physically hurts me every time I see it…
The user should at least be able to define the “preferred” name for those synonyms.
My own tags normally use the original language name of orchestras, apart from kyrillic, which i can neither write nor read…
)