I think your concerns are absolutely correct, but I see them as the combined result of all the flaws within the game. Like you said, cooldowns are a major offender, but so are many of the other things I've listed and things I intend to list in future blogs (like CC cooldowns).
This is a major concern for a majority of the playerbase, however I think you're able to articulate it in a more effective way than most. When people say things like "I hate deep sheep" or "we just trade cooldowns all game" it's all essentially saying what you're trying to describe in a more refined way.
My goal with the blog though, was to go one step further and ask why are we experiencing this "symmetrical" type of play and examine the problem at it's roots. The blog goes on to describe what I see as the core of the problem.
It's possible I should have emphasized that due to those problems, the result is symmetrical gameplay. I do make an effort to reduce the length as much as possible though while still getting the point across.