I would believe that a sex change or bi cannabis plant is due to the need to reproduce, that much cannot be disputed. My personal opinion would be that both male and female cannabis plants have the ability to turn hermie.....a fact nobody ever seems to latch on to. A hermie plant holds a purpose, that purpose is to reproduce. I think a good environment will flat out grow a good healthy male and a good healthy female. I would also believe that shit strains from mothers that were beat down like drunken hookers....might produce hermie genetics....but mostly hemries derive from nothing but the plants natural instinct to reproduce when times are getting rough in the closet.
this stuff is like religion, the creation of earth type stuff.....at some point ya gotta just go with the flow and understand that nature is not controlled but only interfered with.