The irony you fail to realize, the differences listed in fact would be typical of a random Unix system in the 80s, where it's just a mountain of bad and random opinions stapled on top of a Unix system. Some random and half-baked libc? You got it! Some bizarre and overly convoluted greenfield filesystem structure? It's right there! Completely different and frustrating custom linker behavior? Yep!

Everything I listed was an advantage. Now see, I don't think Unix is the be-all end-all of operating systems design. I don't particularly care for Linux, the BSDs, macOS, etc. But Android is a definite regression in the strongest terms. Give me a PIMOS or Genera or Squeak phone that works well. I'll be happier than I would with a Linux phone.

Also Play Integrity (if you run sandboxed Google Play Services), but it only passes at the basic level, which is enough for most apps that use Play Integrity.

That's true, but is contingent on you running those Android apps for it to be meaningful. I have a very small number of interactive things I do with my phone. For me what matters is that writing software isn't a pain in the ass, my usual expectations on storage (eg remote filesystems) works and works well, maintaining my system works, my non-interactive system scripts work, etc. Almost all of this is broken on Android, and it doesn't really make up for it by breaking it to make it better. I find much of the design choices of the operating system to be completely tasteless.

If you say, rely on google maps, banking apps, apps for your IoT appliances, etc. it's certainly relevant. I don't have any of that though.

For me the most and truest pressing issue is that cell modems are very, very tightly coupled with Android. It's still true for the Jolla Phone that it simply is a worse phone because the modem drivers are buggy. This is a complicated issue that isn't getting better, and is mostly to do with both legislation legally mandating the tivoization of cell modems, a weird line in the sand on what responsibilities fall to the hardware or to what software, as well as the modem manufacturers themselves not really caring.

> Desktop GNU/Linux programs are either unusable or a terrible experience on a mobile device with a small screen and no mouse.

Is this an assumption or coming from your experience? Because I'm typing this on a GNU/Linux phone in a desktop browser and use a bunch of desktop applications daily and haven't noticed.

Of course if you run GIMP or something like that it won't fit unless you plug an external screen and a mouse in, but all the applications I use daily are perfectly usable. There's a lot of Kirigami and libadwaita programs these days that just work well on a phone, and if I need to launch my bank's application there's always Waydroid.

If I remember correctly a lot of AOSP core apps have been discontinued though.

The compositor is open (Lipstick) : https://github.com/sailfishos/lipstick

And OSS projet based on the SFOS core exist : https://nemomobile.net/, https://github.com/nemomobile-ux