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.

Let's hope it will be close. MacBook has twice the battery capacity as a run of the mill thinkpad. So 6h of battery would be the default I expect. More than that, and I will be impressed.

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.

This is what i experienced as well. 3h on light battery use. After having read every how-tos and used tlp, auto-cpufreq, powertop, ...

I hate to say it, but, for me, it is the price to pay to not have to deal with Windows anymore. I'm on Ubuntu right now, but have tried with other distros in the past. YMMV.

Battery life of hackintoshes never was that impressive or was it? But if you want apples to oranges instead, then even in its very basic, hacky state linux on that macbook gets 8-10 hours:

https://twitter.com/AsahiLinux/status/1500039345142923269?la...

That's pretty good indeed! I don't like the keyboard layout (I want my delete key!). But that's a minor inconvenience compared to how good the machine appears to run Linux.