They're not hypothetical at all. A1S and Thordan are there to prove it's possible to balance everything without catering to any single healer. There are mechanics in there that make WHM shine, AST shine and few that make SCH shine. Your three lustrates every minute merely match burst you can get by using what's built into WHM's and AST's GCD. Add Tetra and Essential Dignity + Enhanced Benefic's proc + Lightspeed + Synastry and you see that a lot of tools pass Lustrate in healing. That's just overestimating SCH. And I mained it in 2.X, it's the only Zeta I finished and I started Savage with it.