the more I see on sites suggesting the best tanking gear, the less I want to trust them.

Most of them suggest other gear with no shield block over stuff with shield block. Is that just due to them having tanking bosses in mind, where as I want to AoE farm, thus I want to block a lot, so we have different priorities?

Should I be skipping the guides and stacking shield block for AoE farming?

Also I don't really need to worry about getting the 490 def do I? Considering the mobs are 30ish levels below me, rather than 3 above me.