I agree with this. For me whenever my test is high AF and my estrogen is in range I feel like complete ass. I think there is something about balance. With test levels over 5k I don't think estrogen over 100 is too alarming as long as you aren't getting gyno.Depends on the person, I pulled bloods with 3700 and 145 with no AI. No real side effects, mood changes or sexual issues.
Back in the 90's guys used to run nolva on cycle simply to prevent estrogen from binding to breast receptor. AI's are overly used in my opinion. I blame it on trt clinics. They are prescribing crazy AI doses with like 150 mg per week. Then guys on the forums are complaining of no libido and think trt isn't working.