Guess again.
And you can monitor the graphs and see how it's worked over time and it doesn't always just smash it to 100%.
Also I've had 500 odd MacBooks doing this since it's been a feature and have seen a massive improvement in battery related issues on new machines in the last 2 years or so.
Trust Apple to know what's potting with it's own hardware.
But even before this feature I would have had my MacBooks docked all day as well and 3+ years with little in the way of unexpected battery degradation.
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It needs some time to work, run it for a week without Aldente and see.
It doesn't try to not hit 100% but rather slow charges it up to 100%.
Also something to consider is that MacBooks have independant charging and power rails. Which means you don't use your MacBook "through" the battery while on the charger but instead directly off the charger so you don't have the problem other laptops have where it's getting overcharged.
Once it's hit 100% it isn't actively being used as the battery is outside of the equation while plugged in.
I would argue not using the 20% above 80% at all is going to be far more prone to early battery failure. Batteries need to be used to stay active.
This is why you can power your MacBook off something like a phone charger running USB-C, but it won't charge at the same time. Or shut it down and then plug it into the phone charger and it will slowly charge the battery.