Back in the day, you uploaded all your own media. you didn't have access to hundreds of thousands of streaming options across music, podcasts, and movies. Having a single app to upload your media and sync to your MP3 player was optimal.
Now that everything is streaming, and accessible on mobile without a need to sync to a local source, the benefits of media type unity is much weaker. It's easier to have individual apps that provide access points to each type of media library and optimized for that type of media.
But,
There are still those of us (such as myself) that prefer the local media sourcing, using iPods, etc, and that would love a unified app without any store. Just a window into my personal media library and the ability to sync it to a handheld device. Though the options for handheld devices these days are both slim and expensive...
A music app simply lists what you have available. SaaS bloatware on the other hand constantly changes its UI to maximize engagement and nudge users towards ad-stuffed podcasts, because the music is a loss-leader for them.
I just hope this doesn’t actually come with three times the resource impact of iTunes. As far as I remember from my Windows days, iTunes was enormous and basically supplied half the macOS standard library and frameworks compiled to DLLs with it.
It's a fascinating new version of the old stack that works much better on Windows, if those things are true. At least in my usage so far, the Apple Music and Apple TV apps feel much better on Windows than iTunes ever has.
I’m sure if Spotify had the choice they would split things into separate apps. Having separate apps makes it much easier to deploy changes since you don’t need to coordinate (as much) with other teams for every release.
In practice, this doesn't appear to be an obstacle. Companies like Alphabet, Amazon, Meta, Microsoft, etc. have many apps in the App Store "Top Charts".
If anything, this would be a smart marketing strategy if Spotify could (for example) make a compelling standalone "podcast" app, because it would allow them to double or triple their footprint on App Store charts.
It's good to be able to focus on things, but this is way too categorized and just drives even more clutter.
I think that's overly reductive.
They have different kinds of metadata, distribution mechanisms, and ideal UIs.