Hmm I don't think I made any radical suppositions.
The idea that the Europeans would have (eventually) conquered the Aztecs with or without disease cannot be too controversial.
That depends on the Aztecs met. Unified Aztec --> delayed conquest --> Dutch independence --> time to pick up on technology (quite possibly supplied by the Dutch or French).
I'm not sure what you mean?
https://en.wikipedia.org/wiki/Hindsight_bias
Even people who are cautioned against it, commit it, even if livelihoods are on the line (IE two groups of juries are given a test court case and asked to determine negligence, but one is given the outcome and post-event data while the other is given the information available to the person making the decision when it was made). Even though both juries have the same pre-decision information, and even though the one with results has been warned against it, the guilty disparity is enormous.
Now, here we are, in the future relative to the EU IV period, but there is no way to disguise what happened and force players to argue from neutral potential in 1444. Human beings can't even conceptualize that, yet you're claiming it as if it's common knowledge.
The bias against westernization specifically, and not other mechanics that are equally or more ridiculous, is related to this issue as well. In the history of mankind, no losing coalition has ever completely blocked separate peace. At least with westernization, we have a couple out-of-period examples and knowledge that some of the native American tribes attempted it to survive, but were too small in number and bullied by the US government out of their land regardless. As shaky as that is, it's something, which is more than we can say for colonial range, "war score", current regency mechanics, hordes not getting new units, or cannon/cavalry logistics on long marches. It's more than we can say for gigantic 1444-1500 standing armies too.
But what comes up over and over again as "unrealistic"? AE and westernization.
In order to prevent having to repeat this many times in the future, I will generally just shorten the westernization complaint to the accepted term for it.