Originally Posted by corners
I think that all those systems are misnamed. They are not foot support systems. Rather, they are systems designed to keep the foot on top of the foam block that is the shoe's midsole. ........
Pretty much all of these gizmos are straps, tethers or buttresses, nothing more. Shoe "technology" is in the same class as racquet "technology", IMHO. It is much more about marketing than real innovation.
I agree with you. I think the main problem with running shoes is that the side support usually isn't stiff enough to keep the foot on top of the midsole during hard lateral cuts and stops. The foot can slide off the midsole, press out the side, and then cause a critical failure (roll) that can injure the ankle. A tennis designed shoes should be stiff enough to keep the foot on top of the midsole during slides.
If a running shoe has a stiff enough upper, because of straps, etc, then it could be used for tennis safely.