AN515-58 Battery limit function is not working

I did look for third party options, and they don't seem to exist. For example https://windowsreport.com/software-stop-battery-charging/ actually describes two alarms you can use to prompt you to unplug at some power level - and the Asus Battery Health Charging utility, which is Asus specific.

Unplugging puts you on battery power - consuming lifespan. Bypassing flips a switch in the device to disconnect the battery - functionally similar to removing it, which of course preserves lifespan. Asus, Lenovo and especially Dell give the user good access to this switch - Dell has a slider on which you can set both start-charging (say, at 40%) and stop-charging (say, at 60%) levels. Acer has the switch - as is proven by the fact that Care Centre intermittently provides access to it. Without access, your options are to abuse the battery by using it all the time, or abuse it by keeping it under the strain of full charge.

Battery University is a fantastic site for real education on this, by an industry pioneer who literally wrote the book on it: Batteries in a Portable World - A Handbook on Rechargeable Batteries for Non-Engineers. Poke around there for awhile, and you may - like me - regretfully cross Acer off your list of options. I was an Acer Swift user for the past 6 years - and indeed retired my beloved first Swift only because the battery wore out and no replacement was available. I was about to buy a third Swift when I got educated about bypass, and heard about this debacle with the disappearing setting. That's why I bought the Asus instead, and now smile every time I glance down at the green bypass indicator and know that my battery is sleeping peacefully and will have a long life.

I agree that "overcharging" is a myth, and sympathize with your exasperation at hearing it cited so often; but there is real harm from leaving batteries routinely at full charge (and it's understandable that "overcharging" might be used as a casual term for this). Current normal practice is ill-informed and damaging, and something as simple as the switch Asus provides (battery cutoff at 60%) will greatly extend the life of a battery on a computer that is left plugged in all the time. This isn't rumor or myth - it's scientific fact - the opposite of "anecdotal and not tested." The experiments have been done, and the data exists. Follow my link to Isidor Buchmann's site, and you will realize how wrong it is to paint what he presents (e.g., experiments at Dalhousie University, unrolling battery membranes to study the chemistry of capacity decline) with that brush.

As for "general consensus" - faith in it is the mechanism of myth and rumor. The difference between what most people believe and what is actually proven and known is often immense.

As for whether it's very important: that is indeed debatable, on grounds that tech advances fast enough that the device as a whole is generally obsolete by the time gratuitously-damaged batteries expire. However accepting the fact that batteries are consumables is not a sound reason to refrain from implementing easy measures which are proven to greatly extend their life.