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It's official: Smartphones will need to have replaceable batteries by 2027
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Hell, I have a laptop that's over 10 years old. It isn't officially supported on Windows 11, but I'm sure I could get it on there in some unsupported way, using Rufus or another tool that removes the TPM requirements and have it be usable and secure. It runs Windows 10 without complaints. I can run an up to date Linux distro on it and be completely up to date and secure. So, like you said, why can't phones do the same?