"Sorry dave, I know we're mates and you've been in the guild from the start but someone on the internet said we had to replace you because you were bad"
Their guild is 13/13hc and looking for advice to move into Mythic and you're still sitting there with your cutting edge mythic progression hat on, plenty of melee dps in mythic guilds died to this mechanic, especially when we weren't running around with extreme ilvl and healing was tight. Tactics of "loosely stacked" is not at all optimal for this during progression, more circles on the ground to worry about = more movement and more boss downtime.
You wanted one pool on the ground to worry about, if you're stacked enough for that then you're stacked enough that you're splashing damage on each other.