These people can just consider themselves lucky if they never get side effects, especially once they quit the drug and move on to another hair treatment - that's usually the breaking point for those at risk of PFS.
For me it has been 3 years since quitting Finasteride, and since then I haven't been the same. My mental and sexual abilities have been severely damaged this entire time, and in 2 years did not get better by themselves one bit. Only now after spending several hundreds of dollars of various supplements of which most did nothing except tribulus, went as far as to do a bicalutamide cycle to try and reset my receptors, raloxifene, letrozole, and numerous other blind shot attempts to get back to normal, I have some semblance of mental and sexual function back. At most I would say 60% of normal, but from the time I spent on PropeciaHelp a majority there are not even as lucky as I am in their attempts to recover.
RU is about as far as I'm willing to go for hair anymore and I am hovering around a NW2.5 diffuse now, close to pre-Propecia. I'm willing to use experimental things but all 5-AR inhibitors are dead to me forever, after what I have gone through with them. I wouldn't really wish for anyone to have such terrible luck with these medications, but I completely understand the people who use them, because 4 years ago, I was in the exact same position, and had no choice but to start taking Finasteride. You live and learn, though.