I feel as though WHM having these spells also remove the chance of ever seeing other light based nukes other then holy.
Your feeling is flawed, as it most likely has zero bearing on what other spells WHM will learn.

WHM has the spells is has for two main reasons:
1)Increased flexibility so as to not be helpless in solo play
2)Ability to defend oneself to some extent in PvP

Removing these spells would be detremental. I don't really give a rats behind if any WHM in any other game learned the spells or not, or what spells WHM "usually" learns. Let's just squelch developer creativity to match one player's vision!