I think that replacing your software after it stops getting security and feature updates and loses compatibility with apps extends the longevity of your phone's

I think that replacing your software after it stops getting security and feature updates and loses compatibility with apps extends the longevity of your phone's life and creates less e-waste. I used my old OnePlus 6 for longer than I would have if the software couldn't have been replaced because I could install a custom ROM on it.