I've noticed overall improvements in responsiveness as well as the number of apps that can stay in memory without some getting evicted, though the latter is most noticeable when using smaller indie sorts of apps (think Ivory for Mastodon, Narwhal for Reddit, etc) which are on average built more efficiently and aren't dragging around a metric ton of tracking garbage.
This is what I notice as the only frustration with my 12 mini.
A lot of apps don't handle state changes to background well, especially social media apps where there's no reason to cache what content you were viewing.
The camera app is usually the culprit for things getting sent to the background for me.
