Honestly I'm taking the 200-250 from top smn numbers. Where their rdps and adps differences are only like 200 and their parties probably know what devotion actually looks like on the buff bar. My personal rdps and adps differences are usually maybe 100 and I know my team doesn't try and take advantage of it at all, i just do my best to line it up with trick so that we can do more damage.
EF is 7 ticks of about 2500-3000HP. It can be helpful if it comes up during raidwides but honestly I don't see many healers take it into consideration when healing when it's total healing done is the same as if they slap rapture or Assize or something and the moments it can be clutch in are probably also wipe situations. It's just a regen for about 20k hp every 2 minutes and most smns seem to have 80% or higher overheal amounts in any fight so even when we pop it during raidwides the healers are probably popping some other big boy stuff to top everyone off in 1-2 casts to go back to doing damage.
So again it's majorly about the raise.