This is just because LFR can be done by two healers, three if its one of the fights that can CC a healer. You probably won't see an increase in throughput with the EF style in LFR, though you could try 1/2HP instead of 3, but its a slippery slope once you start learning how to cheese LFR.
As for the Selfless Healer playstyle, its completely viable but you have to gear your entire character around it, and again its not going to help you learn to play what you need to be learning for a guild pick-up.