Lots of people have results with RU, the people saying otherwise are the people who craft their opinions without taking into account the bias of the posts that claim lack of results. Most people turn to RU out of desperation when finasteride and dutasteride are not working anymore, expect miracles and like you said, have a million variables including their own consistency that go into it's efficacy.There’s too many variables to get any definitive idea online of if RU58841 works. First of all most people are buying it from the same few vendors who could be selling old/underdosed/something completely different to RU58841. This isn’t an approved pharmaceutical so there’s no standardisation of anything. On top of that people are applying it in different vehicles, storing it in different ways and using it at different intervals. On top of that the few people claiming it works are people already using finasteride and minoxidil to further complicate things. Many people are just dumping it in minoxidil bottles yet we don’t know if these compounds react or not. I think it’s a complete waste of money to be honest, I like MPMD but as previously mentioned he has affiliate links to these companies also, so even his results are questionable (and even he is using finasteride now). On top of that we have exactly 0 human studies available to us to show its effectiveness/safety. Oh and I used it personally before anyone asks and it did nothing for me.
There are enough examples of people who only use RU and get visible results to know that it does work in some capacity. I just don't think it's strong enough to move the needle for the people who need it the most and have exhausted other options.