All this whining about ABS and TC...you guys need to have a basic understanding of these systems. The ABS and TC merely react to the condition that exists between the tire and the surface. That said, tires are the PRIMARY issue. The TC in the Sonic is very agressive when coupled with the factory tires and running on snow and ice. The system is calibrated in a compromised methodology to deal with wet pavement which is the most common condition. That is why they have given the driver the ability to turn it off in seriously low traction situations such as snow and ice. The other issue here is simply speed. Sliding through intersections has nothing to do with ABS or vehicle design and everything to do with tires incapable of dealing with the speed of the vehicle...that is merely a result of driving experience and skill. An AWD vehicle with Michelin X Ice Xi2 tires , equipped with the most sophisticated ABS, driven too fast will slide through any intersection. It's just that simple
I was going about 15mph when I watched that pickup ahead of me slide through the intersection with his turn signal on, I made the same exact turn at his speed, and all I did was gently apply... not the brake, but the accelerator. I can't speak to how good his tires were, and I am not running stock tires. TC would have killed my maneuver, though, since I was starting to slide wide.
While everything you say is generally speaking true, I think the question here is whether our particular ABS TC and SC systems are better or worse than the car with them turned off. TC I would say off, in fact thus far I've yet to find a single condition in which I wished TC was on. Dry roads, wet roads, slush roads, icy roads... maybe TC works for Auto cars, but in a manual with an experienced stick driver, I can get much better results with it off.
ABS isn't the same thing as TC, as it tends to come on in emergency situations and prevents you from doing something stupid Right Now, by pumping your brakes instead of allowing you to stomp them down and lose most stopping ability. An experienced driver with great reflexes can do better, but in general it's a safety device. Trouble is, on the Sonic, with TC on, it's very aggressive and very rough, and I think a hazard rather than a safety. With TC on, though, it seemed much more reasonable. I need a large snowy parking lot and some test time to see if that's really true.
SC is still a big mystery to me, I'm not sure when if ever it has engaged for me, and since I'm not sure when, I'm not sure if it's helping or hindering. I guess, again, that the only way to figure that out is that big slippery empty lot, and doing same maneuvers with it on and with it off. In theory though, despite what you say about it all coming down to tires, SC is supposed to help you get through skids by selectively braking or reducing power to individual tires. If so, that's something the driver can't do, we have input only to pairs of tires at best.