Well, their is a bit of misdirection in the post. The reduction of IGF and GH from estrogen reduction is actually from the administration of SERMs; and at the dose we use them at, decreases in IGF and GH are usually insignificant. Also, the lipid positives that a SERM can have are worth it
IMO, Testosterone's ablity to SLIGHTLY increase fat burning is not from estrogen. It is from raises in IGF(which are barely hindered, if it all by SERMs) as well as prostaglandin production from both the Cyclooxygenase and Lipoxygenase pathway.
C is correct, no arguments from me. But the amount remaining in the system, even with proper administration of an AI and SERM is more than enough for this benefit
D is most likely true(allthough I have never seen a study on it so it remains an assumption), but from my personal experience, the inhibition of estrogen to the degree that is proper in ensuring reduction of estrogenic side effects, does in no way limit gains during the cycle.
Their is not a bulk cycle i have done, when i didn't grab 20+lbs, keeping in the upper teens
So all in all, I agree with some of the points listed, but the degree in which estrogen is thought of as a benefical agent, I think is a tad exagerated