I used to get broken spokes all the time. (Sapim 13 gauge)
So I got the news spokes, DT Swiss 14 gauge.
Why skinnier spokes?
Because I read an article how spokes need to "flex" so that it doesn't break right away.
In summary, it mentioned that rigidity does not equal strength, and 14 gauge spokes are better than less flexible 13 gauge spokes.
No broken spokes ever since.
However, I think it is up to the point... because if you look at Harley-Davidson motorcycles, obviously they have a thick solid spokes.
If you watch Urban Freeride, I think well built wheels can sustain lots of impact.
Love that video... it never gets old!