What I do find interesting is GT3 cars have both ABS and traction control these days and they have great racing. I believe prototypes have TC but no ABS. I realize the mix of talent is much different, especially in GT3 where there are Pro/AM teams and stuff like that, but I'm not sure TC makes that big of a difference on the racing. I don't think ABS should ever be allowed in open wheel as it inspires too much risk taking in overtakes. The whole reason NA F1 revved so high was partially to help keep the power band reasonable exiting slow corners.
As you say, the driver skill is very different between F1 and GT3. If traction control was allowed in F1, the teams would not settle for something like in GT3, it would become an arms race. In the end we might end up with racing determined by who has the best control algorightms, and not who has the best dirver/chassis.