It doesn't help, Karen. In fact. It negative helps.
It is interesting to see some incredibly vague allusions to the MMR process but saying that difficulty is not tied to MMR doesn't help US at all. It might make sense to people who can freely read concept designs or manuals on how the development and purpose of the difficulty system is supposed to work. But, we do not have those. We have MMR.
The game itself says that higher MMR is higher difficulty and that gives you higher rewards. It even encourages players to try to maintain a high MMR for better rewards. Nope. That stuff isn't true.
So, while it may seem like Jvela's post addresses MMR to the simple-minded, it does not in fact address anything relevant to the discussion of difficulty, MMR, antagonists or AI statistics.
A more apt and informative post would be; examples, with video, of high and low difficulty AI, what we can do to get the desired AI tendencies/statistics, what exactly impacts difficulty and how we can anticipate what the next difficulty for the next match will be. As I said above, no matter how high my MMR gets the AI never seems to be able to stand toe-to-toe with the Raiders.
Now, granted, perhaps the AI stops becoming inbred at the 60-70% MMRs but there is no reason to try and get that high. I'd say with how difficulty currently works; that is an impossibility. So the MMR might not matter all the time, as you imply by referencing to Jvela, but WHEN does it matter?
It does not appear to be between 1-40 for the antagonist. Should I power through being a Raider, find a mission which I can easily beat, and achieve a high MMR? Should I lower it?
These are the only two options available to me, you see.