On desktop I prefer black on white, on phone white on black - but I would generally prefer tuning both down to lower contrast than either OS or websites want to let me. On my laptop I have the darkreader addon that lets me turn contrast down. My phone gets to stick in inverted accessibility mode as a part measure that is the nearest I can get. :( I've never yet had a smartphone that let me set display as I'd like - either on Android or Apple.
The nicer hardbacks and art stock were often more a milky or creamy white, occasionally a more neutral hint of grey. Definitely much whiter than paperbacks, but I think most would be a few steps from the hard brilliant white most often seen now.
But broadly yes, until the advent of chemical bleaching in the 19th century basically all paper products were a light tan. Ditto for animal hide writing media
But you touch on something that makes this worse; I prefer a brighter screen when in dark mode, and a darker screen when in light mode. Again, a relative thing. This is why I want consistency, above all else.
Windows has had high contrast modes which do exactly this for decades. It permeates even web pages, though is no perfect there because--surprise!--few companies test with it.
Slack not having a dark mode is also a thing I don't understand.
https://robertheaton.com/2018/07/02/stylish-browser-extensio...
If I go looking for an extension called "Stylish", will I find the original? Is it trustworthy?
Strangely, the same can be true for plain old fashioned paper. The other day I was outside and had to look at a paper. Plain, white printed paper with black text. The bright hot sun reflected off of the paper and I couldn't see anything. A darker shaded advertisement however was easy to read.
So it's all relative. In my case I just prefer not to feel bright light blinding me, so I spend most of my time in dark mode editors/etc. My biggest complaint is that websites don't let me choose. I really wish OSs would start enforcing full dark or light modes as an accessibility feature. As I wright this, my HN screen is quite bright. I frequently flip between my dark editor and my bright Slack work screen. Those bright flips kill me.