That being said, if it were off and lost, this feature would be amazing. Apple is very transparent about it and also allows you to disable it as far as I remember.
The OP has a follow up tweet that iOS 15 made their phone hot during charging. Kind of feels like they might just not be having a good time with their new iPhone or is trying a little too hard to capture some Apple outrage attention. There are better things in the ecosystem to complain about in my opinion but to each their own.