We do indeed disagree on superlinear (as implemented in Steem) not being fundamentally flawed or even any less flawed than linear (I would say in some ways more flawed, but yes both are definitely flawed). It was just not fundamentally flawed in exactly the same way as linear.

many metrics disagree with your opinion

Name one. There is no evidence in terms of actual metrics of Steem being on a success trajectory in 2017 after about a year of superlinear. It was cratering in terms of user base growth, retention, web ranking of the main site, etc. and there is no data to support that more time would have done anything but continue the trend.