I have an elec/kin/physic. Only 43 atm with SO's, IO's and no sets yet. Transference and short circuit both have 3 endmod SO's.
SC will drain about 70% of an entire groups end, followed by Ball Lightning(not slotted for endmod) removes another 8% end from what it hits. Transference drains a lot bosses. Considering before they got sapped, they were slept then fulcrum'ed, what ever does hit me isnt hitting hard and SC will get the rest of the end on the recharge.
With VS, ball lightning and lightingbolt, (3 dmg SO's in each atm) both scourging on the <50% mobs, while removing any lingering/regening end, things die fairly quickly.
Sapping is not required for groups built to kill things extremely fast, but when killing groups that require longer to kill(and AV's), sapping end is a highly effective layer of protection, that will make healers happy, since they can do more than heal. Sapping can be very dangerous with large pulls and not a lot of taunt to go around, be careful.
I love the elec/kin combo. Kin is so intense, being able to drop VS, balllightning and short circuits as my main dps, while healing/buffing/debuffing/sapping/recovering is quite nice.
No, No and No.