You still get the same rectangular screen size for a given size of phone body, unless you want no front camera and sharp square corners. You still get an entire 16:9 screen area in the middle of a rounded corner screen, just with extra screen replacing the bezels on each end.

I'm fine with rounded corners. But I would also like a phone without a selfie camera. I just don't ever use it. If my phone can spy on me then that's the only use the front camera has ever had.

I much prefer maximizing screen to body ratio, even if some sacrifices have to be made: rounded corners and punchhole cam.

I'm also pretty sure rounded corners are stronger on impact.