I think you should do it. I have been running Energy Shield for many years. The fix to Mana Burn has just made this build so much safer. Your only real concern is Poison.
My recommendation is to level as Vita though. It's much easier to level safely as Vita. I wouldn't switch to ES until you can keep your damage high while maxing Telekinesis and having a strong Energy Shield.
There isn't really required gear as you can make it work without any specific gear. On ES Sorc though my #1 priorities are Frostburn and SoJ. The increase to your mana pool is great. Insight on your Mercenary is also awesome. Your Mana Pool becomes your survivability so Insight boosts your survivability.
Don't fall into the trap many people do, Warmth is not needed. Every Sorc should put one point in it, but even an ES Sorc doesn't need it maxed. One point is good. Your +Skills will take care of the rest.
This post was edited by Azire on May 4 2022 12:56am
D2:R