Earlier quoted context omitted.
I came to assume the battery only exists to act as an uninterruptible power supply as I travel to the next power outlet ;) It feels like over the past 10y Linux only went from 2h to 3h of battery life. While MacBook went from 3h to 13h.
You’re comparing an OS with a specific device. In the union case (Asahi Linux on MacBook), the battery life is much higher than 3h. Not yet 13, but soon should be close.
Note that I have been using Linux for 20y. And I fully accept the short battery life in exchange of the tooling and freedom I get with Linux.