I never said there's nothing genetic stutterers can do/ gave complete responsibility to genetics... my first sentence literally says I think learned behaviours enhance stuttering! Epigenetic modification is about expression of genes... inherited mutant genes will still be dysfunctional regardless of how many modulating molecules are present. Additionally, my 'less useful' statement implies there is still some use, just not as much. Im not sure why you took it to mean 'absolutely no use and it's pointless trying'. Hope this clears up some of your concerns