Now for the bezels, mind that an equidistant circle (or squircle) radius converges to zero. So to avoid having a large inner radius, avoid a large outer radius. The Macbook is not a tablet, you do not hold its corners in your hand.
However, at some point Apple must have decided that the squircle is its entire visual identity and that hard corners on the XY plane are bad. That creates design problems it would not otherwise have.
The fact that developers are led into the trap of not pixel matching to the display however just shows a lack of attention to detail.