Already said but it seems Al Dente is the best solution for now. I think it's a joke that Apple hasn't implemented an 80% limit on all their devices. It's on the 15 series iPhones. It just goes to show how out of sync Apples operating systems are. Put it on macOS, WatchOS, and iPadOS.
My 15" M2 MBA always charges to 100% even though I have Optimized Battery Charging enabled. With my normal usage a 100% charge lasts two or three days. I guess it hasn't learned how much of a charge I really need. I've installed
Battery hoping it does the job.
I think optimized battery charging only works in certain situations. On iPhone i think it only kicks in if you're charging overnight. The idea is that it will learn from your routine/habits and charge to 80% then wait to charge to 100%.
So say you put your phone on charge before you go to sleep at 10PM it will probably charge to 80% by about 11PM. It'll hold at that until ~6AM and start charging to 100% assuming you wake up ~7AM.
Also, you need to have certain location settings enabled as it goes by that too.
The only product that OBC works for me is Airpods
It's useless for me on my Watch as i like to wear it when sleeping to track it.