As most pointed out already, you’re talking what I said about a specific thing out of context, while there is some merit of it that can be applied to Mythic+ it was mainly for static difficult content like the Mage Tower that is supposed to be difficult.
There is some merit to the weekly affixes not providing equal weeks of difficulty, this is something hard overall to combat, no matter how you tune them there are going to be easier weeks than others just with the nature of how M+ works. We try our best to tune them though and its a constant iterative process.
It sounds like most of your issues are not from difficulty of content but rather social, players leaving or mad about dps over mechanics so I don’t get the point of quoting the original post or my quote.
As for your Shaman bit at the end, the recent 8.1 tuning has made Shamans more than viable in Mythic+ in all specs. I mean Ele cleave for M+ is quite strong and Resto seems to have a fairly decent representation in 10+ keys. I haven’t had any issue with any shaman in a 10 or higher since 8.1 at least in my experience.
There is some truth to what your saying about some of the social issues you’ve encountered that have made M+ difficult but that difficulty doesn’t seem to be from the content based on your post.