partigyle with no boil sour?

I’m planning a partigyle type brew with a big saison (~1.090) with the 1st runnings.  I’d like to try an experiment with the second runnings using east coast yeast bugfarm IV.  Is there anything detrimental that would otherwise suggest to brew as usual and boil the second runnings?  Why is it that only berliner weiss’s are no boil (at least that I’ve seen)?