Blizzard only planned for 4 tiers of gear when they were balancing stats for LK. Instead, we ended up with 8 tiers which lead to much faster scaling of stats for all classes. So basically, they did learn from the past, they just didn't plan very well for the future.

Also, if I recall correctly, part of the dodge debuff in Sunwell was to counter avoidance tanking -- rogues, for example, who stacked dodge and other avoidance stats to the point where they were literally unable to be hit by a boss. DPS, tank, and no heals required all in one package!

Even with the avoidance DR tanks are capable of "not being hit" to a degree. A lot of warrior tanks for HM Anub are stacking BR gear so that the only hit they receive is a blocked hit. While it leaves them at 35k hp its for tanking adds only, since bosses hit so hard even blocking every hit will still 1 shot a tank.

IMO Stats are out of control in LK which is why they are revamping it so much in Cata. 50% crit, while being hard capped hit, is ridiculous considering in BT dps wasn't getting to that level untill the final tier of gear while we've been at that arguably since Naxx. Also for healers, their regen is so high than even spamming their biggest heal, they can last an entire fight before they oom.

Icecrown Radiance!

Happened before, probably gonna happen again. Oh well. It'll be really nice as a healer, at least.