I prefer physical keyboards, too, as do many others. It turns out those of us who spend a lot of time composing text are outnumbered by those who do more content consumption, though, so the surface area is given to touchscreens, and profit-driven manufacturers seldom bother with keyboard models any more.

I'm not sure. I think this can be attributed to gaslighting too. We can see companies trying desperately to push one and the same paradigm, with phones it has succeeded, while elsewhere it hasn't to varying degrees despite a lot of effort. If it was about preference and competition, there would be no need to push anything, and if pushing something has succeeded, then this is not solely a result of preference and competition.

Maybe with a less oligopolized market of, ahem, everything, vulnerable to network effect, we could say it's a result of preference and competition.

Device manufacturers are on kinda secondary roles in that.

As for light quality, yep, incandescent bulbs were generally more pleasant. But not so much better as to justify the pollution now that we have 8 billion people on this planet.

Well, those monochrome displays of old generally weren't made blue, for example. They were made green and amber. The difference for economic purposes wasn't significant, but for health it was.

I don't remember how exactly LEDs work, but I think making those with spectrum a bit better for human health is a good idea, no? Feels stupid that I have one blue LED lamp, the rest being neutral, and I have seen such, but I don't often see LED lamps of warmer colors. It's as if fashion were that blue light means modern, cold light means strong, and so on. And that warm lights are something old, decaying, like those old books with yellow pages, or like your memories of childhood. Or maybe something infernal, from the time when we didn't have what they consider basic tech comfort today.

I think it's fashion. Or more, a promise of some bright future, a city on the hill, for which it is necessary to do things the "modern" way. Humans are irrational, they don't emotionally feel that one color is just as modern as the other. But when the "modern", promised way requires to reject some comfort, that means also rejecting one's own common sense. Which means rejecting one's own preferences and demands and wishes from tech, which are very different from corporate policies even for the majority. And that means giving oneself to MS, Google, Apple, Meta etc.

OK, I might be overthinking it. Just treating our time the way medievalists treat Middle Ages.