CI is back into niche territory(or a transitional stage to shav's low life build?), never did play around with energy shield much my self, usually opting for eldritch battery if going the caster route(and I really really like the new EB, very fun mechanic if a bit keystone heavy).
But CI is definately still viable as a build simplifier(life and chaos res no longer matters), so it might cheapen your build if trading, and at least give some fewer needed rolls on gear.
Another reason it's no longer as popular as back in open beta is that chaos damage has been nerfed to the ground, I hardly bother with chaos res anymore, it's more of a nice bonus, compared to the shotgunning titty bitches of instagib in the old days. Back then CI was suggested even for melee characters(ele cleavers).
This combined with increased physical damage(stun is calculated based on what hp you would have had if you hadn't picked CI, aka fuck all), means stun immunity is pretty much a must-have, as physical damage will hit you harder than most other builds, since you have to sacrifice quite a chunk of armor/evasion to get high ES(Mind over matter can mitigate some of this, but that makes it even harder to squeeze in auras).