The thing is some posters here don't advocate doing DPS even when their primary responsibility is met. Now that's the issue. Most tanks don't know how to maximize damage output is also another one. You can have tanks doing as low as 400dps and on the extreme side, some tanks can do 1.5k dps, both are doing the same fight. How does that happen actually? Is it just a coincidence that most tanks that advocate pure tanking do as low as 500dps (pls check if anyone here gets that number btw), when optimally you can do 800dps in full tank stance? For tanks to have as high as 60% difference in DPS despite both in the same tank stance uptime is sketchy. People aren't readily going to admit they do low DPS either nor they will say they can't press buttons in a logical way. One word I can say: skill. This is why the discussions always end up in a huge mess because it represents 2 sides that dont want to talk it out. A good discussion can only happen when common issues and understanding match.
How do you feel yourself when you see OTs in 24mans doing way less DPS than you especially when you are main tank, and even worse you are on 100% tank stance? That's a huge red flag people need to look into. And this is not even looking at those DPS at 200dps in Weeping, for goodness sake.