Agreed, at the risk of sounding like a stuck record. SE have the absolute perfect job/sacrificial lamb to throw under the experiment bus for this and it boggles my mind that they haven't had the bottle or been willing to put in the effort to at least try it for an expansion.
Take AST, throw it's DPS kit literally in the bin. Let them spend GCDs buffing team mates with some less efficient method of converting that into raw damage as needed for solo/msq content. Drop a 'totem' and throw cards at it to pulse an AoE or something. What matters is having a completely left of field healer that doesn't just slam nukes for the bulk of their GCDs like the rest. If it's really bad, there's 3 more healers for people to fall back on. If it's borderline, tweak it Creator style and see what happens. If it rocks, look at what can be done for another healer like Sadge.