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Apple to Buy TSMC's Entire Supply of 3nm Chips for 2023
(www.macrumors.com)
This is a most excellent place for technology news and articles.
Repair would have to become easier or cheaper if you want people to use their phone for 15 years. It's incredibly likely the screen will break in that time frame.
The EU already demanded user replaceable batteries, outside of that just not using software lockdowns a la Apple would already allow 3rd party repair and manufacture of equivalent parts, going even further the Fairphone is modular and with open specs, this kind of modularity and open protocols would theoretically allow smartphones to be Ship of Theseus style immortals.