E2 levels can be managed without an AI.
We were discussing AI usage, not E2 levels. In the same article that was linked above, there are some valuable things that weren't quoted:
"There are scientific studies that demonstrate estrogen’s potential beneficial effects to a man’s vascular system. These protective mechanisms, however, have to be weighed against pathological damage the very same estrogen can induce.
As I mentioned earlier, despite the documented dangers of excess estrogen, levels that are too low also present risks, not only to bone,45,47-49 but to the vascular system as well.46,50,51 If a man were to intentionally lower his estradiol too much, he could very well suffer vascular disease because estrogen is vital to proper endothelial function.52,53
This is why it is so important for aging men to have annual blood tests. If estrogen is too low (below 18-20 pg/mL), or too high (above 30 pg/mL), corrective action should be taken."
....
"Some men are so deficient in aromatase that they do not make enough estrogen.
If a blood test reveals estradiol below 20 pg/mL, which may occur if Arimidex®, for example, is being taken at too high a dose, one should consider reducing the dose. Alternatively, applying a tiny dose of a compounded topical estradiol cream to the skin several times a week may also help increase estradiol levels. Follow-up blood tests 30-45 days later can assess if too much or too little topical estradiol cream is being used."
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So the same article that talks about the dangers of high E2 also discouraged the use of the AI, because of potential negative effects of lowering E2 too much.
Not to mention that any substance, which affects liver enzymes simply cannot be safe for long term usage.