This is just as weak as a counter argument. If every argument that concludes that lifestyle changes are necessary, in most situations and for most patients, are just written off as some sort of moral high ground and not necessarily something to take seriously, then what do we have left?
Is there seriously no functional difference between healing a broken bone and getting someone to stop smoking? The only problem is just that we haven't found the right medication for the latter? Evidence of necessary lifestyle changes as part of some moral crusade?
The science is pretty clear on the subject and it is up there as one of the most well studied in medicine. Yes, anyone can stop smoking and anyone can gain or loose weight. Yes, lifestyle changes are the most imporant factor in a treatment being successful.