The benefit of having some (any) facility to be able to write non vendor prefix/semantic infested CSS and to have nesting take care of an otherwise entirely unm

The benefit of having some (any) facility to be able to write non vendor prefix/semantic infested CSS and to have nesting take care of an otherwise entirely unmaintainable flat CSS selector soup so far outweights any drawback that whatever argument you'll contrieve to construct against CSS preprocessors is essentially null, nill and invalid.