>The same is true of most modern smartphones. If you wrote an app for an early version of iOS or Android, it simply won't run on modern hardware or software. APIs have changed, SDKs weren't designed with forward compatibility, and app store requirements have evolved.

I wrote a simple niche app for Android a decade ago, when I got my first Android phone, just to play around: https://play.google.com/store/apps/details?id=com.abragame

Forward compatibility is not perfect, it got taken down a few times for compliance reasons (I think I had to fill out a form on whether my app was intended to be primarily used by kids?)

Still, it runs on modern devices with modern OS versions without a hitch. (Much faster than it used to on my HTC Hero in 2012). If you wanted to bemoan mobile functionality degradation, I'd aim at dependencies on communication with proprietary servers, which various companies don't feel obliged to keep around for long.