It was just a vision from long ago. But okay, for sake of argument. It doesn't need to be ultra hd in a billion colors, it can go on the bezel and be screen height so that you don't have to aim to hit it. No need for it to glow intensely, perhaps not at all, perhaps simple single color LCD would do the trick.

I don't agree scrollbars work fine, they use to work fine, now they are to tiny to click on.

There also was/is the issue where the view port width needs to be adjusted when page state grows beyond the screen height then word wrap makes the content shift down. Is the solution to have one so tiny it is hard to use or should one always display a scrollbar? The one outside the screen is always there :)

I like things that do only one thing, do it well and in a simple way.

You could also go the other direction and put everything on the screen. Huawei just made a horrifying laptop where the keyboard is also a screen.