Also keep in mind IRIX (and most classic desktops) assumed 72 DPI displays rather than 96 DPI displays. That means when you view a screenshot or render them unadjusted they look 75% the size they did back in the day. Still plenty denser in many ways... just not as much as loading it up on a modern "96 DPI is 100%" screen would imply.
Then I go and enable compact look on firefox, take out a bunch of useless icons for things I don't use, and bam my 4K screen is able to accommodate all my work. Even though I do still use 125% DPI scale, not via KDE mind you, because I love eyes.
And even then, it still looks slick and modern. It's crazy how much space we waste with flat design on desktop. Crazyyy.
I'm half joking, I did use i3 for a few years, and have tried many others (bspwm comes to mind). But currently it makes no sense to use keyboard centric wms of any kind.
StumpWM and XMonad do the same and they are quite easy to use, especially the former.
They also lead to very space-efficient setups. Windows can be tightly packed.
(But yes, in general it's all custom "cards" and list views. HTML didn't allow a good set of GUI widgets, so people adapted, and now the cruel circle has closed with desktop UIs being "informed" by web and mobile views)