Can't argue that Adlo has gotten a very significant increase in MP cost, but maybe you should take the hint that it's not meant to be a spamable skill.
Spamming Adlo was already a noob trap in ARR/HW and left you OOM quick.
Lucid Dreaming restores roughly 1k MP per tick (960 if I'm not mistaken) * 7 ticks = ~7k MP every 2 minutes, or 3.5k MP per minute. Now this is all for current values, so this is going to get worse as we get more gear. You have roughly 18k MP as SCH. So every minute you restore 1.8k (Aetherflow) + 3.5k (Lucid Dreaming) = 5.3k MP per minutes as opposed to 3.6k MP per minutes if you had old Aetherflow and no Lucid Dreaming. So you MP regeneration actually got buffed, unless you refuse to take LD, but that's only on you.
And I know it's not part of SCH's kit and it helps the other healers just as well, but Mana Shift and Refresh are a thing, and they are strong. So if you really are hurting that much for MP you might want to consider taking a support role into your progression (which you very likely already do anyway).
The Fairy nerf was roughly 17% on Embrace and Fey Illumination getting reduced from 20% to 10% (which was a bigger help for your co-healer anyway). That's by no means nerfed to the ground.
And only these 3 things made SCH amazing? It's whole kit was and still is amazing, but it's less on auto pilot.
Now I really am convinced you never did any serious raid content. Sacred Soil has seen so many uses. J-Waves, Holy Bleed, Whirlwind, and many other AoEs which you can make so much easier to heal through would like to have a word with you.
Also, not everyone will always be topped for every mechanic.
I'm not sure where you are getting at here? But SCH has the ability to reduce incoming damage so the other healer can heal up. It's not a one man show (unless you are solo healing).
You mean those skills that are all on a fairly long CD and have a combined lower HPS than the fairy? Besides the point that these are not directly comparable as the fairy and WHM's oGCD heals have different uses.
Does SCH need a Cure 2? Or is one healer "spamming" their stronger heal enough?
I don't really like the comparison but if you account for Physick + Embrace (roughly 170 real potency) you end up with a 570 potency heal. I know the fairy has a 3 second GCD. But it's pretty clear that WHM and SCH have different approaches to heal people. And as chance would have it, the synergize really well.
The impression I get from a lot of "SCH" is that if their job is not the 100% mandatory healer for progression (and even then, see HW launch), they think their job is underpowered.