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I don't really "get" most of these comments and concerns - you can still export an .xml file in seconds and leave it in the same location as the Music library - you could rename it "iTunes Library.xml" if that is what the 3rd party app needs to see

easy to do and just takes seconds and you have the same xml file that was always available ?

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Of course you have to do this every time you add to or update anything in your library.
 
Of course you have to do this every time you add to or update anything in your library.

True - that said it is easy, simple and fast to update the XML info by exporting a new file

I agree it is better to have an API access real time library info - but it is a relatively easy "work around" to use the export until the 3rd party apps (DJ APPS ??) release new versions that can work with the new Music app

What I do find very curious is the lack of concern about the column browser and it's ability to search large libraries with multiple filter criteria (column browser) - now (Music Catalina) there is a single filter field that disappears and must be manually accessed for every new search

I thought the lack of a column browser would be a big deal but I don't really see many comments about this missing feature that has been a core feature for so long.
 
What I do find very curious is the lack of concern about the column browser and it's ability to search large libraries with multiple filter criteria (column browser) - now (Music Catalina) there is a single filter field that disappears and must be manually accessed for every new search
I think you'll find there's plenty of concerns for the lack of both here: Music - Missing Features, Bugs, Issues & Troubleshooting
 
It's called backward compatibility, and in general, if a feature is going away that many depend upon, lots of warning is given: think about the removal of support for 32 bit apps: several Mac OS versions warned us, and now in Catalina, it's finally complete desupported. Not so with the sudden desupport of XML. DJ's are not beta testers, and desupport should have been telegraphed to them as well as those who build apps for DJ's well in advance. It was not. the OP is simply incorrect and in his comment.
Actually, if you read through this entire thread you'll find that Apple has had a replacement API for about 5 years or so, and the XML access has been deprecated for some time. Neither Apple nor DJs are not to blame, but the makers of the DJ software have been aware of this coming and some of them did nothing.
 
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