I think this issue spans many of the secondary effects. There is a reason Fire is the most popular primary. Its secondary effect is MORE damage (small dot). AR's main secondary is def debuff (if I remember right), which again helps in dealing damage.
Energy gets KB (which is sometimes not good), Ice gets slow (which only helps if the enemy is actually hurting you in some way), electric gets End red (most stuff dies before this becomes effective), Dark Blast gets ACC debuff (which lasts mere seconds). Psionic lowers recharge.
The problem with electric and most other powers in these sets is that the effect is neglegable. Most fights come down to damage. Fire and AR speed up a fight, the rest may help lower damage your group takes, but not enough to matter.
Perhaps the severity of the secondary effects needs to be increased.