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It has a stable interface on top of Linux, which desktop linux does not have.

Android is not backward compatible. Many old apps are crashing or refuse to work on newer Androids.

Most of them aren't though. Significantly more old games work on Android than they do on Linux desktop distros.

This is why everyone is dropping Linux support and targeting Proton instead.

The only time I've seen old Android games stop working is when they use native 32bit libraries and most Android devices are now unable to run them.

Other than that Android backwards compatibility has been quite good, much better than Desktop Linux anyway!