So recently I’ve been seeing the trend where Android OEMs such as Google, Samsung, etc. have been extending their software release times up to like five, six, and seven years after device release. Clearly, phone hardware has gotten to the point where it can support software for that long, and computers have been in that stage for a very long time. From what I can tell, the only OEM that does this currently might be Fairphone.
Edit: The battery is the thing that goes the fastest so manufacturers could just offer new batteries and that would solve a lot of the problem.
I don’t think there would be any advantage in stopping yearly releases.
I think individuals should stop buying new phones often and that you should still be able to use a 15 year old phone just like you can use a 15 year old computer without security risks (with Linux).
That’s what the system or laws should encourage.