I think you're reading lone's comment the way I read it at first, i.e., that he's talking about the edge radius on the side panel flanges. But actually he's referring to the corner radius:It's also an excellent way to hide the screw holes ! Nicely done !
The corner radius does detract from the aesthetics in a minor way, but I think that's preferable to having sharp corners. It's something that dates back to my experience with the first M1 prototype, which didn't have rounded corners, and why the production version had them. It's just one of those minor concessions to user-friendliness that most people won't notice - but they would notice if the corners were painfully sharp.
Also, the primary reason for the flanges on the side panels is really to keep them straight in the front-back direction. If you recall, the M1 had some panel warping issues early on. That was largely resolved through a combination of pressing the panels flat after punching, and using tension to keep the side panels straight, but I wanted a more structural solution from the outset this time around.
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