Honestly, you might look into the new arm-based apple silicon macbook air laptops. Those processors will actually get faster over time as more developers optimize their apps to take advantage of the efficiency.
Super thin, 18+ hour battery life, aluminum casing, amazing retina screen, and works nicely with iPhones if you're already in the Apple ecosystem.
[Edit] If you dont want to use macOS, you can throw Asahi Linux on it. Its optimized for the Apple silicon hardware.