Why don't we just scale up old content to be relevant?

[RavLandslide]

It's not just HP and damage that would have to scale. We have a lot more tools than we did at 50, so some mechanics would be trivialized without adjustments.

I honestly feel like it's 50/50. Yes there's a bunch of content that would become more trivialized, but there's also a lot of content where I often think "If only I had this ability right now," where I don't think having the ability in question would ruin the fight.