Very good question and an equally good response person get high end boards for them to do more, have more, monitor more stuff and last longer than regular boards for added peace of mind and future upgrades!
I find MOB0's are in (3) categories: Cheap, Good and Overkill. The Sabertooth is deemed as 'Good'.
The Good has minimal Phases for lower vCore (OC) and attributes for long-term reliability and performance. Truth be said less 'doodads' is better for key component performance to reduce overhead from 'shared' bandwidth that otherwise hinders performance. In general 'most' MOBO's, other than OC or PCIe, more less perform the same; benchmarks within margin of error +/- 0.05%.