Wouldn't it be better to also show Duplicate, or File Already Exists rather than just quietly adding _1 ?
I have to agree - your suggestion sounds ideal.
In both circumstances, MusicBee is detecting the duplicates, but handling them differently.
So for uniformity's sake, I would also vote that in the 1st image/scenario, it also asks users what they want do with the duplicate filename when detected.
Edit:
I support this as it has potential to be a stress factor when dealing with multiple files as mentioned by Mr Benn.
<Filename> as a field is not built into the existing Duplicates Manager.
So I'm currently just struggling to think of how one would be able to locate those duplicated filenames if they were erroneously configured in the hundreds.
Edit 2:
Oh no, there is a "more" section in the duplicates manager where somebody can easily setup a virtual tag that references the filename as the criteria.
So the aftermath can still be rectified with no biggie.