[__MatrixMan__]

I question that last statement. Not a Mac person myself, but I've noticed that when one of my coworkers plugs their MacBook into the TV in the conference room their resolution becomes so high that they can't see anything.

Some among them know how to get it right, but the majority just open chrome before plugging in and zoom to 500% afterwards.

[nitrogen]

Possibly a 4K TV that reports its DPI wrong? Or maybe reports it correctly and macos scales everything for 10 DPI

[__MatrixMan__]

Somebody pointed out that the text on the TV is actually the same size as the text used to be on the Mac--it's just that the TV is mounted too far away from the people for that scale to be the correct one. So I think maybe the Mac and the TV have successfully conspired to achieve some kind of real-space equivalence on the TV (though the Mac is now unusable by whoever is presenting since the fonts are all three times too small).

My point is less technical: when a new display device appears, the computer can't know how that image is reaching users. It could be VR goggles or it could be a jumbotron in a stadium. A better design would focus making it easier for the user to tune the scale, rather than assuming that the Mac knows best.

[vetinari]

This was one of the issues in linux-land, that EDID info about DPI cannot be trusted.

Projectors obviously have no idea about the final DPI and TVs often lie, because same board is used across a range of models. It is the TV equivalent of "To be filled by O.E.M." .