This is a really long thread but worth at least skimming. The author is a former forum member who also was a TRT doctor and a steroid using competitive bodybuilder.
He hated AI’s and only allowed his patients to use SERMs. The issue is not with high E2 but with the ratio of T to E2. Estrogen has many positive benefits but you need corresponding high T too.
Simple rule to follow :
High E + High T = good
High E + Low T = bad
Low E + High T = bad
Low E + Low T = bad.