I use very little anti skate, most of the time none. One could argue that some anti skate could provide more focus however there are tradeoff with and without. I usually use the gauge to get the VTF in the ballpark. I usually set by ear.
The key word is 'little' and 'some' anti skate. How little is little , and what is 'some' on those with an AS dial (which I read is not a universal measurement, like 1.0 in one tonearm can be the equivalent of 2.0 to another) or the string weight assembly. It all becomes subjective as even adjustments by 'visual' - how fast or slow the arm/cartridge slides inward at the deadwax, is not a fixed standard. The biggest question to me if it 'by ear' is that, what do we listen for, to determine where the AS force (if ever) is set?