I am not sure about the exposed connector on the side of the system that inserts into the Joycon. I could see a kid jamming the controller onto the system at a bad angle and breaking it.
I’m very curious what they’ve done to prevent people accidentally forcefully removing it during gameplay. The sliding lock was annoying at first, but if you’ve ever gripped the controller hard at a pivotal moment it’s probably good that it didn’t rip away or even stress the parts.