I'm willing to bet that the systems that VW are using in the Porsche's are very similar to these ones, just biased more towards what enthusiasts want. Would make sense to adapt the tech that you already have instead of developing an entirely new system. You're right, it would be very nice to have control over these systems integrated into the infotainment. I'm willing to bet that the reason that they aren't is to help idiot-proof the cars. When it comes down to it, ASR, ESC, and SVR/RRO are safety systems. For the average driver who treats their car like an appliance, the factory config is adequate and makes sense. It's trying to remove any chance at losing control, which it does very well and is exactly why we butt heads with these systems. We want as much control over the car as possible and the safety systems are getting in the way of that. We want to control the car instead of the car controlling itself.
Yeah, it's just a shame they can't trust people who'd be willing to pay more for the access. Some of this stuff isn't bad near the limit in certain circumstances, even on a track. By itself, for example, ABS traction control can indeed be predictable and useful, and ABS in general is convenient much of the time. Tie it into other systems, though, and things change. You've attached suspenders to your belt, and while it still holds your pants up, you're now in trouble if you have some bad shrimp.
I don't blame VW as much as I blame the morons they have to serve; but to be fair they've taken intervention beyond the pale, here. They did go much farther than they needed to.