It wasn't an insult. The only one who's been constantly belittling everyone and mocking them for daring to question anyone was you.
Pointing out a lack of first hand experience might cause you to underestimate something isn't an insult. Discussing experiences isn't an insult. Sharing what I've experienced and telling you it isn't an insult.
On the other hand, you can't make it past a single post without attacking me directly. And honestly it's just draining at this point, and there's a reason why there's plenty of people disagreeing with you and calling you out on it.
Outside of raids having some unique effect on a weapon or piece of gear, BiS gear has for the most part been determined by stats. That's why I included the stat qualifier, since you even said "item level doesn't always matter". It could be something as silly as a socket on a ring even nowadays.
I don't know what relevance the second part has, but that's just another situation caused by the same core issue, corruption was all that mattered in the end. Stats didn't. Item level didn't. The only time you'd replace a piece of gear was if they shared the corruption you needed.
To which I said, I would love to see proof of people clearing the mythic raid without their BiS corruptions. I get there's trickle down effects that cause people to latch onto what the WF race does, but at the time of the WF kill, the average item level of Limit was already pretty much at the cap you could get.Corruptions were a huge power swing. I never stated otherwise. I only stated that the bis gear was not the only viable gear. There were other viable corruptions then the best one for your class. Blizzard was doing a lot of hotfix balancing to both buff and nerf. With the later changes to the system it got a lot better but there were still more then one viable corruption. Everything else is you trying to argue things I never disputed.
If the WF raiders needed that edge to kill the boss even while geared out of their teeth, of course people below them will also require similar. But there's also oddity groups who like to prove that they don't "need" that kind of stuff, and try out nonsensical stuff to prove a point.
But again, I don't recall many, if any guilds doing that with corruption.