Have you looked at other controllers' joysticks? The ones I've seen have the ball visible along with everything else. I'm not really sure what you are arguing here.
EDIT: The only real difference I can make out is that the actual stick part is a bit on the thinner side. Maybe it's an issue, but...
Since people who are going to play like this will either use the pro or Gamecube controllers, I kind of doubt this will be much of an issue. I also haven't heard many cases of joy-cons physically breaking, they seem to be quite durable from my experience with them. I don't think the wii remote...