Current battery life is better than it was on Windows. I know Windows is very good from this standpoint but things always degrade over time. That is my expectation with arch as well - good now but let's see how it is 6 months from now. That is always the real test. Regardless, my laptop is too small to run Windows + WSL so will probably stick with just running Linux.
Arch Linux is an eternal OS, it can migrate through different hardware and there are people who never reinstall it (you don’t need to) for, say, a decade. Mine is half a decade at least, and went through three laptops. The last one was (Intel) MacBook Pro dying on me (the keys), and I just rsynced my system onto another MacBook (booted with Arch install) via ssh. Took me an hour or two in the background. I left my home and returned to a working laptop that needed a few tiny changes in configs here and there.
