Trivialize all content with 10d Shockburst/Rods Deadeye
Demo:
https://www.youtube.com/watch?v=jaijtZHutdQ
The Build
This build clears full screens in one click with Galvanic Shards, and kills t4 bosses in a couple seconds with the lightning rod combo. Lightning rod is definitely the best way of setting up shock for shockburst rounds because it can be placed before combat. The shock can be extended with Stormfire if necessary.
This build is extremely efficient because it is an Exodia of abusing like 7 different mechanics that are due for a nerf (rods, crit, triggers, herald chains, howa, grim feast, etc). Galvanic is simply a delivery system for heralds. Lightning rods do millions of damage and set up a huge shock and can be stacked up before combat. Crit seems like a massive multiplier from your tree with very low gear investment.
The Balance
This build is also a reflection of the peculiar balance state of POE2. A lot of these mechanics are so strong that I believe their usage is almost non-negotiable. It feels mandatory to put HoWA, heralds, and crit into all attack builds. There are no competitive alternatives to the strength per investment that these mechanics provide. Lightning rod prestack weapon swap also may be at that point.
The Gear
Pricing is in the guide, with all the prices that I bought the items for. It totaled up to 8.1d at the time of the video, but it's actually less with the current ex:d ratio. Really not many good items in there. A lot of it was just setting up a weighted search and tweaking it until items became affordable. A lot of the gear is total garbage so there is a lot of room for upgrades and optimizations. I'd probably start with Ingenuity and a corrupted Atziri's Disdain. The jewels are very important, they give more than 8% damage each.
I believe crit comes out to about 40.7% before Ambush/EOW, and I had about 440 int, so that's what you'd need to replicate my numbers.
POB:
Guide (includes gameplay from demo link):