It's probably just me being petty. But, the deep concave shape of the thing leads me to believe the design intent was to make it easy to funnel the plug into the socket, so you're not fumbling around trying to find a hole you can't see easily. But, unless you recess the jack back in the socket, you end up with a lip at the bottom of the "funnel", so you actually fumble around more trying to get the plug in. Then, once you've got the socket mounted deep enough for the funnelling action to work, then you've got to have a straight plug that's chamfered around its shoulder, or it won't plug all the way in. And forget about angled plugs. No way you can use those.
So, you end up with a guitar that needs a cord whose ends are just right, which to me is NFG. Cords fail. Replacements are easy - usually. But, not when they have special requirements.