I don't totally agree. Orlanth, Storm Bull, ... are cult that were described many time as the creator of the game considered that they would be the nice cult to play. It is a designer choice to give the nice fun spell to these cult, and nothing to the others. And with the time, they justify this with Myth, Culture and a lot of game material.
Why is Art, Dance, Entertainment less important? When a troup comes to a village, the whole village comes and sing, laugh, ... This is a lot of people for the 'worshiping'. Maybe even more than in the Orlanth Temple (where there is manly the males) or in the Ernalda temple (where they are all female).
My point is : Why should a small cult (i.e. a non described cult by the authors since decades) be less fun to play than the big ones? I don't see that as minimaxing, but more as 'I want to play this and it should be fun...', and being fun also come with basic spell as extension or Heal wound.
But I know the answer : YGMV (but I like to read others opinions as it feeds mine and in the end, I find a way to have fun with my players