Like what? Feel free to quote instances of this happening.
And what do you mean by "explaining your logic"? You can't just prove a claim by going "that makes sense, right?". You have to provide EVIDENCE.
Let's take an example case of yours:
You claimed:
The Claim: "it is necessarily detrimental to balance the game for mythic rather than the average player"
Your Proof: "the spec disparities at mythic level do not reflect the spec disparities for the average player"
Can you explain, please, how this works? Where's the causal connection here? You have an OBSERVATION: "spec disparities" are different at the mythic and average level. How do you demonstrate that this is due to BALANCE, and not something else, like, say, sampling bias because mythic players tend to be more skilled than the average player and so their spec performance profile will necessarily be different. And even if you just call that "balance", too, how do you demonstrate that it's MYTHIC balance that causes this, and that we don't just see different disparities in mythic because of how it's balanced for NORMAL, say, or heroic or whatever else.
You are throwing wild statements out there that you then claim are self-evident or "logical", but they really are not - as I have demonstrated here.
Feel free to refute any of this with actual evidence, but just going "I've already explained this you just don't want to admit it" only makes it even more clear your claims are baseless and you're trying to wriggle out of owning up to that.