With that in mind, in terms of pure form factor, the Asus Flip Chromebook (2015) was about as close to perfect as possible. Sure, its processor was anemic even at release. I'd want a higher quality screen. But the keyboard was very good by my standards. The 10 inch screen was the perfect size and was 16:10. Weighed around 1.8 pounds (0.82 kg). If I could have that form factor with modern tech, I'd be in heaven.
Second favorite is the current iteration of the iPad Mini. If I could get that with an M1 or M2, full MacOS, then I'd be happier than (insert metaphor here).
Third favorite was the 2015 Macbook. I'd wish for a better keyboard and more ports, but overall the form factor & weight was extremely good. Would be stellar with a modern Mac kb and Apple Silicon.
Fourth fave was a tiny Sony Vaio from 2000. Forget the model name / number. Also under 2 pounds with a 10 inch screen. Honorable mention to the Asus Eee of 2008. Screen was too small but otherwise it was a perfect size & weight.
I guess I'll have to try a GPD laptop one of these days. They seem to be among the only ones providing tiny & small laptops.