Closed circuit used to be an interesting way to use Lightning Blast it provided a decent Crit chance for builds and incentivized using Lightning blast as a clearing/buff skill (instead of the popular single target convergence node) to support skills such as Runic Invocation and Static Orb.
20% increased damage and 50% crit chance is pathetic compared to the amount (stacking 15/40%) it gave before. This dumb change pretty much kills the node making it a waste of skill points. If the infinite stacking was a problem it could easily be capped to 10-5 stacks.
Its pretty sad to see cool playstyles nerfed into oblivion.