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system settings -> battery -> battery health (i)

choose "Optimized Battery Charging". seems to be exactly what you're looking for

Not the same. If your charging pattern is unpredictable, that setting will be absolutely useless.

I have it turned off on my MacBook Pro, but on for my phone and iPad. my 4 year old macbook pro's battery is doing great, my iPad is still holding on (but it spends a lot of time unplugged or powered down), but my poor phone is hurting badly (4-6 hours of charge per day, claiming it's at 80% battery life).

my MacBook Pro still thinks its battery is awesome, even plugged in all the time.

No, that's a completely different feature.

Which is also on iOS.

That delays charging to 100%, but still always charges to 100% in the end. I'm talking about never charging beyond 80%.

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