It seems to me the bad design is hanging the camera from a part that was not designed from which to have the camera be hung.
Have you tried a strap that hooks to the parts of the camera that were actually designed for a strap? A tripod socket is generally engineered to handle compressive forces. That is, it is designed to hold things up (E.g. your camera and lens) that are sitting on top of it and pressing down. Hanging the camera upside down places tension on the socket that tests the tensile strength of every part of the assembly - from the adapter you screw into the threads of the socket, to the threads themselves, to the screws that attach the socket to the floor plate, and the floor plate to which the socket is attached. When measuring tensile strength the whole assembly is never stronger than the weakest link.
I realize all of the ads for those things have really attractive super-cool looking people walking around with "Madison Avenue" grins on their faces while they look really super-cool in their super-cool clothes and their hipster mirrorless cameras hang upside down at their sides. But take a look around at the next world class sporting event you attend. Almost of those grizzled old fat guys on the sidelines with 10-15K of gear strapped on have most of it hanging by either the strap lugs on the camera or the strap lugs on those huge lenses, and are not hanging it from the tripod socket. They've been doing it long enough to know what works and what doesn't.