The new raiding meta is making me want to quit.

[Ultima]

Well high damage should be expected from DPS in high end content. However, different things should be expected from tanks or healers.

As I said, if the only way tanks or healer can make a difference is by their DPS, then the game has a huge issue and won't last long (the raids anyway).

Then you admit the game has a huge issue that isn't being addressed. That's good, the first step to recovery is acceptance.