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Aside from an armored behemoth yelling insults or "Look at me, look at me!" not making sense from a role-playing standpoint...
-- Why are we really trying to fight something that works so well, and has been tried and tested?
When I say "we" I refer to people, who have spitballed ideas in the past about breaking that unholy trinity we call tank/healer/dps classes.
I've had some ideas on abolition myself, but there is always an inhereit flaw somewhere.
- Give everyone the limited ability to heal. (Class trees wouldn't be allowed to emphasis this much/at all, or you'd end up with some pigeonholed into being a "true" healer.)
- Remove 'taunts' from tanks, and instead gear all of the classes toward dealing some sort of damage. The closest person would get the aggro. (But how many ways can you make a DPS class do damage differently, really, and to what end.)
- Everyone regenerates over time if left alone. Essentially forcing you to run and hide/rotate tanks while you regenerate. (Unimaginative, and ruins the flow of a fast-paced game. Not to mention makes it easy to harrass/zerg rush a single guy down.)
Just a few examples.
I'm not saying we shouldn't try to work around it, or come up with new ways to abolish "LF healer/tank" in trade chat, but is it really as bad as we sometimes make it out to be?