SCH is technically an expansion job, and was not available until ARR, which is v2.0. For the sake of argument, we'll just say it is an original job to ARR since this has been the starting point for a very long time now. Even so, it is a job, which have a minimum starting point of lv30 for all ARR and HW jobs. Only classes start at level 1, so it would need a starting class of its own, or share it with conjurer.
I disagree. I find that it is actually really important for healers to learn to heal this way in the beginning. It is what they will have to resort to if they ever find themselves in a situation where their oGCD abilities have been exhausted by a less than optimal party, which absolutely will happen to them. Plus, abilities like Whispering Dawn, Illumination, and Lustrate will not exempt a SCH from GCD healing in the early levels.As for WHM creating the wrong habits it’s to do with the fact WHM has no oGCD’s before 50 and the first one it gets to someone who doesn’t know how healers work “feels” like a panic button (benediction). Meanwhile SCH has the fairy to help and by 50 has 3 charges of lustrate, whispering dawn and illumination
You really don’t play shield healers proactively in anything besides high end content. SCH does a much better job of teaching healing habits at low levels than WHM does
Besides, WHM remains primarily a GCD healer throughout the entirety of its leveling process. Weaving oGCD heals isn't its strength, and it can only do it in a limited capacity. Tetra and Bene are on 60s/180s respectively, and they only get one charge of each. They do get some other skills to help out such as Assize, Asylum, and Bell, but they have nowhere near the same oGCD availability as the other three healers. Lily abilities might be instant and can have their potencies increased, but they will still reset the GCD and cannot be weaved between offensive skills like what the other healers do. You're basically saying WHM is an inferior healer, and that's fine if you feel that way. But I believe the job was intentionally designed to have a low APM. It's a great class/job for beginner to novice players.