I guess its all in what you believe . I also have 2 Mustangs both with them and zero issues and over 5 years on one and 7 years on the other car . No not a daily but they both get used and no issues with warping at all and any help in breaking on a go kart to a 18 wheeler is beneficial .
I don't think it's all in what you believe. I think it's all in the physics. Less swept area = less braking power. Less rotor material = less strength.
Slots and holes are basically marketing. They look cool and there's nothing wrong with that. Especially if your car sits around a lot.