Happy to keep using my 13 Mini. I replaced the battery in the last year, so that is a non-issue. Will probably keep it on iOS17 to avoid slowdowns. If Apple never, ever makes a smaller phone again I will inevitably be forced to switch (inside or outside Apple’s ecosystem), but for now it’s still working fine.
A reminder to all that the most eco-friendly thing to do is keep your current phone. We live in a culture of constant upgrading, but withholding our consumerism helps the planet in the long run. Staying with my Mini is also partially influenced by that.