What does a square screen have to do with that though? You need the side by side windows to be 1:2 too?

More than one lane seems to be ideal. I'm assuming running 3:2 like in the early 2000s, everyone these days is running full screen and alt-tabbing constantly??

Give me as wide as they come!

I like some things full-screen, like my browser, but vim (ok technically full-screen itself, but split) always 2-3, probably most other things 2 side by side.

But I don't have a square monitor (I think it's 16:9) I don't see why that would be an improvement. If anything surely we want it wider for side by side use, so more 'lanes' can fit?

On my 5:4 screen I would regularly split it into 4: 2 up, 2 down. This was perfect. A lot of inferior window managers seem to restrict splitting to only in one axis, and even two only two windows. It's lame.

I'm on bspwm, so I can split all I want. But split 3 lanes seems to be nice for my workflow right now. But a 3:2? Damn... how skinny are those windows everyone is using, or what fonts!

On 5:4 I would only have two lanes, but I could split vertically as well so I usually still had 3-4 windows at once. On 16:9 I find splitting into 3 lanes makes them slightly too narrow, but it's workable.

As for fonts, I always make my text size as small as possible on every device I own (well, the ones primarily used by me at least).

But doesn’t this make a vertical line right in front of you, making content outside of your central vision? I like my main windows to be right in front, and less important things to both sides of it - that way, I don’t have to constantly turn my head.

Having a split under your nose feels like reading a book but putting the page you’re currently reading past your ears

Hmm.. I guess, but it doesn't matter. With dual screens there is a split right in front of me. My chair swivels so I can adjust my body to make looking left or right comfortable. I've never really thought about it and don't think it's a problem. When I read a book I don't fold it back on itself, both pages are visible at once.