You need a decent pool to survive waiting for the CWDT proc, of course.

I'm over 8k.

Why would you call 40% block "essentially no block"?

That's higher because of Aegis' 32%, but it's still less than half chance.

From my experience there isn't anything more instant than CWDT, where did this happen to you?

This hasn't been a single encounter, but one from this league would be the new chaos Voll Bone archer guys.

Whirled into a pack, BO wasn't up, they procc'd a few crits, rip.

My aegis SR necro is sitting at 315K without damage nodes, arcane surge and all that.

The investment cost is 100x as high as well as gear cost etc.

Don't even need a 6L going Allelopathy.

There's essentially 3 skills usable for the Aegis/super tank type necro; SR, ED/Contagion and Blight. With Allelopathy, Blight has eeked out ahead imo. Free 6L, way higher damage than the other two options due to Wither totem, and the pathing suits taking the actual dps nodes etc. you get positive chaos resistance easily, etc.

Temp Chains is mostly used for the duration of Blight, Wither etc. not so much the slow.