If you carry your notebook around every workday, it makes a big difference.

If you're on a long journey, it's even more of an issue.

I have the first GPD Pocket which I used when traveling for a while (it's now fairly outdated and always had some annoying quirks but that's another story). It weighs 480g. The great thing with that is that you can just drop it in your bag and basically forget it's there while walking/traveling around.

This is definitely not the case with my 1.23kg Macbook Air.