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Custom ROMs have had just about enough of being Android's second-class citizens
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
That's true for every operating system. Old apps aren't updated to use new system APIs and such and they eventually stop working.
On desktops we can use virtual environments, translation layers, plenty of solutions to make old programs and games work on a modern OS. Phones are somehow incapable of this.