Yes, but that’s not in-software, the screen is actually, physically rounded. Using software to straighten that out would have, quite literally, no effect at all on these machines.

But most importantly, when connected to sharp-edged monitors, the Mac does not round the corners and instead displays the entire contents of the screen edge-to-edge (including the desktop and menu bar). So this tool seems to be solving a problem that does not exist.

Do those pixels even exist on the display? They certainly don't on the iPhone; the implied corners on those are physically outside the device.

Yeah I really thought (and actually still think) the rounded corners on the top left and right of the new(-ish) MacBook Pro are hardware. I know for sure they pre-date Tahoe!

They are hardware.

There's software like Top Notch if you want to make the bottom corners rounded also.

TopNotch also solves the problem this app targets I think: the rounded corners are not visible when the menubar is black.