Nah, sorry, enshittification is not "just an excuse". My current 2020 phone(xperia 5-ii - I wanted that sd slot&jack) is noticeably slower than when I got it, even though the battery is holding up decently(it basically needs to last a day, and it usually does). Software shops seem to get focused on testing their stuff on "modern" devices. It looks like, once your device starts to slip out of that "testing pool", things get increasingly buggy until it eventually makes general use enough of a pain to require replacement.

I think last couple years' improvements to battery tech made software take over batteries as the bigger contributor to device obsolescence.

So this change, while welcome, is a bit late.