Also, since I had an atari st as my first 'serious" computer, I loved the B&W monitor and b&W GEM.

I'm still looking for a way to preserve the low-color feel for my macbooks and mac desktops. Also I love the idea of low-dopamine UIs in principle.

For same reasons as the original author, I find myself to abandon the B&W mode and then do not turn it back on later.

I'd envision OS layer that handles the desktop, finder and apps, and an API that apps like browsers can use, e.g. in chrome extensions.

Anyone here aware of work in that area?

It’s in the accessibility settings. You can assign an action for double or triple tap.