You’ve clearly never owned any kind of AirPods then, whether they be original, version 2, Pro, or Max. They all work exactly the same way with the only difference being that the Max has only one battery and the others two. But combined, all of them have similar battery life of 20’ish hours. None of them have an off switch and all of them deplete battery slowly, even when the AirPods read 100% charge when in their case. But that 100% reading fools people into forgetting the case for those older AirPods is depleting its charge roughly at the same rate the Max does. I’ve never heard a single complaint from anyone that the AirPods or AirPods Pro have no off switch. If no one complains for those, why complain about the Max?
The benefit of having AirPods being always on is that they connect instantly (or don’t actually disconnect) and also allow Find My to work. Find My saved my wife’s pair of AirPods Pro. One fell out of her ear in my car and we couldn’t find it. Find My’s alert sound showed us it had fallen into a small hole under the driver’s seat where the power seat plug connected to the car’s power supply. Without Find My, we’d have never found it. As it was, it still took an hour and many scraped away skin layers to extract that AirPod from the tiny hole. That feature saved us a lot of money. The same could happen with the Max if you happen to accidentally leave it behind somewhere or can‘t figure out where you left them in your house. Have you ever forgotten where your phone is? I’ll bet you were happy you could ping it with Find My.