> unsuccessful people can tell you teach you plenty of "don't do this mistake",

But how can I know for sure that that particular mistake is actually why they were unsuccessful? Has exactly the same issue as listening only to successful people as they hardly know what actually made them successful most of the time, but they still compose large blog posts with their reasoning for why.

Again, I still think my approach of reading both but then regardless go my own way is the preferable approach, at least for me, ymmv.