Why do you think everyone who liked BG would prefer BG3 to resemble the old? If anything, the number of potential people coming to those games who had never played D&D was probably a lot smaller than those who had. To fit in the former category, you likely would have had to be born somewhere between 84 and 90. To be in the latter category, anywhere from 1900 on up. Sure, you could have been born in 1970 and never heard of D&D until BG came along; but that would be unusual. I would posit that most of those who played and enjoyed BG1&2 first enjoyed and played D&D, and thus, welcome a return to what we think of as a more pure D&D experience.
I will see if I can find the thread you mention.