Uh? High DPS is definitely reserved for DPS (or there's a big problem), and healing is for healers. I'd like to see you tank a group as DPS with your self-heal, that would be funny.
No, and at some point we have to admit that maybe that's not the issue. The problem with group content is that everyone has to get something out of it. If your tank wants to pull, let him pull: the vast majority of dungeon groups go fast, do w2w, it's not going to kill you to keep a more moderate pace that makes you lose five minutes at most. I don't know when it became cool on this forum to claim that tanks who don't want others to pull for them are the ones causing trouble. It's starting to get tiresome: the very principle of group content is that there has to be compromise. Here, if your tank is doing w2w, go at a reasonable pace, you can let them pull without it changing much for you.
If it's totally impossible for you to adapt a little to a different pace, then you need to play in a guild. That's literally what they were designed for: to be grouped with people who have similar play styles. But now we find ourselves in the ridiculous situation where people don't want anything to do with a guild, but still demand that everyone around them adapt to their little whims. We're talking about an MMORPG built around a trinity system. That's the basis of everything, as you know, and it's what's respected in most in-game runs. If there's a disagreement, you need to make sure everyone's okay with it. And, worst case scenario, here's a tip: the chat bar exists. It's a wonderful tool that allows you to confirm whether the tank is comfortable, whether the healer allows you to greed however you want, and other minor discrepancies in the overall system.
No. That argument came out of nowhere, pure fabrication that suits you because it would magically allow you to be right. As a healer, it annoys me quite frequently—not because of a lack of skill. On the contrary, it gives me something to do rather than painstakingly spamming my DPS spells. But when I see a DPS pulling, often clumsily, with a tank who is clearly uncomfortable with the situation, I'm sorry, but I just think you're being very rude to the people around you.The only tanks that get mad at DPS pulling ahead and healers DPS'ing are incompetent ones.
In short : people aren't your personnal bots. Act accordingly.