It's not possible to set a hard limit in macOS without third party utility like AlDente [1].

I was referring to the built-in "Optimised battery charging" feature. When this is active and has decided it will cap charging at 80% [2], you get a "charge to full now" option in the battery menu.

[1] https://apphousekitchen.com

[2] I do agree that this feature sucks and rarely actually works, unless you have a very predictable charging schedule.

I leave my laptop plugged in 95% of the time so in practice this caps it at 80% (helpful).

I suspect quite a few people do that so it probably is net-good overall, but agree it doesn’t work well if you’re moving around a lot.