Comment by sillysaurusx

I think because they had to. The rounded-off center part is actually the part you usually stick your finger into to lift up the lid. So it wasn't done for wrist ergonomics, but rather because it would've otherwise been sharp. The result is a big hole in the center.

It looks a bit strange, but to each their own, I suppose.

EDIT: this thing, below the trackpad https://imgur.com/a/DVzlDOj (What’s that even called? And is there a better image hosting service than Imgur?)