That's actually a good argument, and should have been up front and centre.
Although, my understanding is that a lot of Sartar, Holy Country and surroundings aren't that high up...
Perhaps it's just me... This "we really don't care much about the sun" just seems really odd! If Elmal was left alone as the sun, (even as a sub-cult in a Yelmic monomyth), perhaps losing *some* of his Fire powers, it would all makes sense.
If Orlanth chained the sun, and it therefore does as he commands, it also works...
Ignoring, laughing at, pitying the god that you actually rely on, and enjoy being out in - doesn't.
I know Glorantha isn't real, and thus RW logic doesn't apply, but I kinda figured that humans are pretty much humans... is there a RW example where people anthropomorphised a natural phenomenon that they need to survive into a god that they shun?