I own both a 11.6 MacBook air and a 12in MacBook and the screen size is absolutely fine. Not a device you want to use for split screen, but not everyone needs to do that (or will simply use a second monitor for that (or an iPad on the go as second monitor).
Having said that, my main on the go device is now a Thinkpad Nano, which has a 13in (not 13.3) screen on a body that is the same weight as my 12in MacBook and has cellular too.
However I'd absolutely buy a 2 pounds MacBook with Apple Silicon, especially if it has cellular. You no longer even need to have the screen under 13/12.5in since you can just make it with smaller bezels nowadays...