Mostly because the rules for the racing class either allow it (or require it), or don't allow it. No question every race team would use ABS were it allowed. Even F1 cars used to have ABS until the rules changed to prohibit it. And ABS improves the safety of EVERY car on the street, whether used for performance or just cruising around.I totally disagree with you. Not that it's not great, but it's value to me and others. It's a no brainer to me. It's not worth the cost for my pleasure car.
Why do some race cars have ABS and some don't? Because it's a different kind of car with and without. It's a different racing experience.
MSRC improves EVERY Corvette, whether your goal is better performance or more ride comfort, or a choice between the two when desired.
OP, Mr. Corvette hinted at one important point. To get Performance Traction Management you need both Z51 and MSRC. Whether PTM is important to you or not I don't know, but unlike the C7 you can't get it without also ordering MSRC,