You make a good point, though you present it in an awkward manner. Android has everything to do with Linux in its usage of the Linux kernel, but its userspace offers none of the actual advantages of using a Unix-like kernel.

The GNU/Linux terminology is actually quite relevant here, seeing as Android is Linux, but not GNU/Linux. Hell, Android's libc comes from OpenBSD, so...

For instance, I can mount the filesystems on my Android phone on my laptop running Linux and copy music over.

Can I do that with an iPhone? Maybe, but probably have to put up with a lot of Apple garbage, trying to make things "easy" for non-technical people and/or keep you in their ecosystem.

I also like that Android uses Linux because I think the proliferation of Linux is good for me. (For various reasons, not that I have a financial stake in it, although I do indirectly due to my technical areas of competence.)

In that sense, I prefer that it uses Linux marginally over, say, using FreeBSD, which I would still prefer infinitely more than a proprietary OS.