What advancements? Both iOS and Android have for a few years reached maturity, not much exciting with each new update. At least not without new hardware, as most updates are to support something physical (notch, fingerprints, face scan etc).
I used to hate my phone not being updated, so switched to a brand of Android that kept them up to date. But lately I don't really mind. Only reason I upgraded to Pie this weekend (after being bugged by the updater for months) was because of a few emojis I couldn't see properly when being sent to me. The update hasn't done anything big. Things are a bit rounder, the clock is now in the wrong corner. Some BLE issues as well, making me regret the update.