I don't know, I have been using SASS/LESS for a while and I almost never use the & because 95% of the time, I am talking about a descendant when I use nesting.

I don't know, I have been using SASS/LESS for a while and I almost never use the & because 95% of the time, I am talking about a descendant when I use nesting. I think it would be very easy to accidentally typo or miss in a review the difference between "& .sub-class" and "&.sub-class."