I mostly use mine for web browsing (but I also typically have like 100 tabs open). With iPadOS 15 Beta and 3GB RAM iPads, I'm already experiencing way more reloading than I find tolerable.
Personally, I'd go for the M1 with at least 8GB RAM if I wanted 5 years but I'm picky.
There's an Air 2, Pro 9.7 and 5th gen in use by others in the household and they seem perfectly happy with what they have. Well, the 5-yr old Pro 9.7 is starting to show some weaknesses. It has issues handling 8-way video conferencing and some of the videos are blanked out.