If you want to call four years of observing how Steem works and doesn't work to be a knee-jerk reaction than that's your prerogative, but I disagree.

Proof of Brain is an intriguing idea but one which has just not panned out. Most of the failure modes were predicted in posts made within the first six months to a year (and no, not by me primarily, if at all).

What has happened over time is that available evidence has entirely falsified the idea of Proof of Brain as a growth driver (which is what it was intended to do, and which it clearly has not done since there has never been significant growth apart from, temporarily, during major price spikes) and has mostly validated most of the theories about its failures (vote selling, vote trading and self voting, all in various obvious and less obvious forms, for the most part).