This IS evidence based, and a well known fact for most hair loss sufferers in this forums. Minoxidil induced gains are almost completely gone within 2 years. It happened to me, and it happens to almost everyone else. It is clearly described in the graph I posted below, which is from a study published 17 years ago.
https://www.ncbi.nlm.nih.gov/m/pubmed/10534633/
So yes, it is a fact. The real question is, are people who respond to microneedling able to maintain over the 2 year mark? That is something I would very much like to know. If not, then I guess most of the responders here were effectively just responding to minoxidil. If they do, then it's most likely needling doing the heavy work, because it's mechanism of action is allegedly different from that of minoxidil.
OH, and of course, this should be evaluated in people who are not on finasteride, because finasteride users are much more likely to maintain in the long term.
Also GrowPro, I'd like to insist once again, in a respectful manner, that you start posting before and after pics, because no matter how many times you claim there was no hair there, it's overly deceitful to follow the approach of only posting an "after pic". Those micro hairs you are showing us are so tiny that they aren't very noticeable to the naked eye, so they might have been there before you started treatments. This is a very common mistake in people that get a magnifying lens for their phone camera. They always find micro hairs, and if they took the pic after treatment, they think it's new hair. The bad news is that, those who do it right and also take pics before treatment also find exactly the same micro hairs, and they had no idea they were there because they were undetectable.
I suggest we all follow a good and scientifically reasonable conduct to evaluate progress in this thread, otherwise this thing will lose credibility. We need to provide good evidence, so let's do things the right way.