I have not yet built a clear own opinion how to see these kind of flags in case of "over rewarded" articles. From a pure rational point of view they may be justified. On the other hand one should not underestimate the psychological effect on steemians if suddenly they get flagged (or at least feel the "threat" to get flagged). I remember the case of @karenmckersie: she was quite shocked after receiving a flag. Again my personal opinion is that indeed this special article was overrated, but on the other side if one considers it from her point of view to have written many articles which brought only very few money even if she invested much time (we could also say "underrated articles"), then it can be very frustrating if the only well paid article finally gets flagged and most of the reward is lost ...
Therefore I appreciate it even more that you explain so thoroughly why you did flag this article of @thecryptofiend. I think it is much more easy to accept and understand a flag if it is explained in such a nice and friendly way. That helps a lot against the first (and very human) impulse to feel personally attacked.