4) Did I mention that people are idiots? Also some people learn from idiots and then pawn off the wrong facts as true and might even mangle them even more in the process.
It is striking to see how statistics is used by different fields and the strong disagreement by field. Statistics is unusual in that it is broadly used in research and practice by individuals who are not trained statisticians
And (in part) because actual statisticians are unlikely to be involved in producing or even reading these sources, they can be an echo chamber of bogus claims (like regression requiring normally distributed data, or Kruskal-Wallis being a test of differences in medians, or a that a p value is the probability that the result "was due to chance", etc etc etc).