I have heard the same things in the past but I think it has to do with the user more than the compound. Think about it. An oral otc run for only a few weeks appeals to newbs that are scared of needles and probably don't have the right diet and training in place. The same people that start their cycle before they start their training, do no pct and then stop their training or are sporatic about it after.
This isn't to say that good bros with their shit together don't use them too. They do but you get what I'm saying.