I'm confised by the argument - Windows 10 is free, they can do anything they want. It's not really free. Just because you used a free "upgrade" option, does not make it free. And the copy that I actually purchased (I don't want to "upgrade" any of my machines) is exactly the same and has exactly the same issues.
I'm also confused by the arguments that extra "apps" are so small that you won't gain anything by uninstalling them. Clearly, I do not uninstall them in order to gain storage space. We're using terabyte hard drives these days, few megabytes of junk is irrelevant space-wise. However, these little "apps" constantly update themselves, interact with some web sites, and so on. It's just annoying to have them. And it's not just candy crush. Why do I need a "sports" app on my PC? Is it really an essential part of the OS? You seriously believe the OS will be less stable if I remove it? If that's so, then the OS is just bad and should be avoided.
Well I'm sure that most apps in a OS are ment to be there if they were not they would not be there.
Time was that browsers, networking, firewalls and backup, anti-malware, file compression and writing to optical media were all handled by 3rd party (often paid-for) utilities, now they are an expected part of the OS. If a web browser were not included in an OS these days, it would be very difficult to acquire any other software (other than a limited range of apps controlled absolutely by the OS manufacturer!) - the browser has become an essential part of the OS, and all and any functions provided by a browser, if missing, would make the OS a poorer choice for many users.
In fact, the presence of the browser in popular consumer OSs has changed the method of distribution of software, news media, and music.
In short, an imagined "unifexOS", with it's inability to run any music related material out of the box, would put it low in the OS popularity stakes, and it would not survive long unchanged.