oozo what you say makes close to the most sense anyone has said about it all. but the mmr still apears to be random. its like the health bar of a dk tank in a raid
Historically, it has also often simply reflected that someone chose to keep playing the game and accept the risk of high losses versus sitting on rating and swapping to climb on alts to provide themselves a buffer on the ladder.
Big picture, once again.
One has to wonder how ladders would look if spec CR/MMR was made account wide. 
They have a pretty forgiving range just to try to shorten the queue times. So, they are opting for faster queue times at the expense of better matchmaking. And, the system seems to be more volatile for tanks and healers than DPS.
If you throw in some duo queue with a wide spread in their MMR, then you can get LULZ MMR matchups.
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Not sure what this has to do with OP. But maybe Blizzard should design a âbetterâ system. Canât blame the players for working within the confines of the system they are given. For sure would be more healthy for the game if one player couldnât soak up multiple R1 slots on the ladder.
Thatâs for Dragonflight rewrite the words to War Within
You could ask the author to update. They said itâs a living thingy. Perhaps the main systems have not changed. So there is still good info in there.
Edit: I went ahead and submitted feedback to wowhead asking them to update it. Maybe that happens. My understanding though is that basic info provided is correct: CR, personal MMR vs group MMR. What is displayed and how it moves generally, etc