I have my problems to imagine how my workflow would look like if this feature got implemented - perhaps you can help a little.
In general: would MP3tag open the GUI or run silently?
like that would leave me with the question: which files would be treated by that wss?
Would I have to supply a folder or at least a single file as well or would the standard folder be used?
What happens if that folder does not only contain a single album but is e.g. my folder for podcasts (which would probably not create a lot of hits with the most prominent wss). What happens if only one file from that folder leads to a hit and all the others would be overwritten with the wrong data if I took that suggestion? (I think I would have to abort that wss-call and start from scratch with just one file selected ...)
What happens if no file is loaded? (Because I always start in an empty folder / because I forgot to include the filename in the command line.)
I assume that all further wss-steps like selection of the issue, arrangement of files in the correct order would then be carried out as usual with user-interaction (which in a way answers the question whether MP3tag would run silently), yet, if the idea was to run the wss sort of automatically, it would have been interesting to see how the correct data would be assigned.
Perhaps you could elaborate your idea a little.
Just as side note: it has been requested some years ago to run actions via command line, see here
My vote would be for it to run silently and would be okay with risk of script user error when specifying an entire folder. But you could first handle single file case, then hopefully take up the actions script ability I suggested ten years ago from the link you quoted. Thank you for your program!