It’s the resolution I care about more than the aspect ratio. A squarer aspect ratio would just be the icing on top. But yeah, if you’re happy with 1920×1080, then it’s not too difficult to find machines satisfying the other two requirements.
I think it's just that unfortunately a lot of these laptops are geared towards gamers, and pretty much all gaming laptops have 16:9 aspect-ratio, and they also usually use high refresh-rate screens, which are also almost entirely in 16:9 aspect-ratio.
https://us.msi.com/Laptop/Bravo-15-A4DX/Specification