[qwerty456127]

Half a decade is not much. My phone is a flagship from more than a half a decade ago and everything (except the GPS module - it usually takes minutes of standing still to hit enough satellites and knocks out the whole new battery in under half an hour) works perfectly fast.

[selectodude]

Half a decade in mobile CPU time is massive. The A15 is, at minimum, literally 5x faster than the A10.