Casting

[CKNovel]

Your best way to look at cast would be... The ranged role.

In HW they had 1.5s cast, low enough to weave, high enough to make the GCD feels like having an impact.
The problem is that BRD was not designed to work with casts while MCH was.

So they removed it in SB for both BRD and MCH.
It did wonders for BRD but MCH... Its kit made no sense anymore. Which is why they had to remove a lot of MCH kit from SB to ShB.

Even if SB MCH would have an overheat button during SB it would have remained a boring job during filler phases.

If you were to remove casts from casters, many tools would not make sense anymore.
BLM Leylines would feel weaker, its triple cast would be useless thunder stack would be extra damage only.
SMN ruins and extra ruin would be useless.