How much WHM DPS is enough?

[Almagnus1]

What if WHM personal DPS (without healing) is best in the game?

[Shurrikhan]

What if WHM personal DPS (without healing) is best in the game?

It would mean nothing compared to the others' superior ability to cause a raid to clear faster. As the gap widens, the trailing healer would be disallowed or difficult to maintain even in increasingly casual groups.

[Menae]

What if WHM personal DPS (without healing) is best in the game?

Better than the other healers? It doesn't matter, you take an AST/SCH anyway unless the DPS gap between the WHM and their replacement outweighs the raid DPS increase of the other two AND the AST/SCH can solo heal content.

Better than every other job? First of all, they get nerfed, because DPS classes would rightfully be ticked off. Still, though, you wouldn't take them as a DPS slot because you'd kill your LB generation, and you wouldn't take them as a healer slot unless the other healer is solo healing, albeit a much safer version of solo healing.