A hypothetical is not a strawman.
Whether gear is required for content is up to blizzard. Blizzard could tune mythic to not require gear and move the gear to pet battles and make it matter there? Would that make sense? Would you like that? No, because you know that it is weirdto lock gear progression behind niche content.
I don't care what's "reasonable". I care what is fun. How does it make the game more fun to lock gear progression behind unpopular content that most players don't want to do?Right? You keep ignoring how gear progression is possible currently with multiple paths. If you want the highest possible gear though you are required to do the content that offers it. Which is reasonable. A player can choose where progression ends based on the content they want to do. There is nothing wrong or unreasonable about that.
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Only rated pvp gives the good rewards, which does not have a queue for finding a team.
The purpose is that its fun to get upgrades.