Not comparable, ED has 2 charges and the target has to be near dead to get max potency out of it. Which on a range especially, is highly improbable lol.
Lustrate has 3 charges and will give 3k potency heal regardless.
Scholar has an AoE instant, theoretically, Astrologian does not outside of Abridged and Celestial Opposition. CO is much stronger than Indom, but Indom has a lower CD, isn't countered by Wither and obviously also isn't a flat heal and the strength of it is extremely conditional.
Scholar has a safety net in Excog, Astrologian doesn't have this at all.
Focalization. Astrologian doesn't have anything like this as the healing has partially been sacrificed for offensive pressure.
However Astrologian is the stronger healer because the offensive pressure is just that much better, but the weakness is if it falls behind/team plays too defensive it's pretty horrible. It's not as strong as you think it is and you'd only have to play a few customs with good players to see why WHM is still a meta pick because it's extremely safe to play with way better MP regen. The larger issue with Scholar is SE keep insisting on making it some kind of gimmick healer but since HW the job hasn't been deep enough to really play on SE's perception of how they want it to play so the end result is a job they designed to be played offensively but also get punished easily ended up being extremely good at being punished, but awful at playing offensive and as a result, is good at nothing.
I mean for starters you're playing Scholar wrong based on your previous post, but as it's pretty obvious you've been doing just training queue I can't really hold that against you, because there's so much wrong in that post including but not limited to - using aura blast for gauge and not saving it to be used defensively, actually caring about Seraph when it's probably the weakest healing CD in the entire game and not just in PvP either lol (but it's weak in PvP for reasons other than potency), multidotting bio (and then somehow complaining about mana issues, SCH has horrendous mana issues - but this is the worst thing you could possibly do - just bio the kill target lol), and attunement is one of the worst healer CDs in the game especially now. One because ok, I feint you, you attune like you do pretty much every other time, I then hard swap to you with double CC and burst. You have no answer to it because you aura blasted for gauge and we baited your attunement already and you weaved your lustrates whilst applying bio. That is possibly the worst way I've ever heard Scholar being played. Never ever rush Seraph