Well, currently you just need 3 targets and one Cl to drop a massive EQ.
In Legion you need 5 Targets drop a rather mediocre EQ after 2 (Or 3 with bad rng) Cl's.
Granted, you can boost 3 Cl's with Stormkeeper but that's about it, leaving out the 10% chance from Static Overload due being a rather low chance proc.
The Imp. Cl perk was just really powerful and actually something that i enjoyed about Elemental in WoD(at least the post 6.1 version), because it allowed to abuse the perk in a situation when 3 targets were next to each other even if just for a short time.
And the Single target Dps boost that AoE provided was very nice.
LR is bad outside of Stormkeeper and Static Overload procs, altough when those 3 things meet, serious Dps boost happens.
My guess is that this talent is supposed to fill the void left by Imp. Cl perk, being able to get a Single target boost out of an AoE situation, although currently it's way more clunkier than the Cl perk.