I eat everything you mentioned. Corn I limit a lot but I’m actually having some kernels today for lunch mixed with other frozen vegs and I’m not going to exclude them.
White potatoes I eat sometimes, I like the taste but understand they’re inferior to their sweet counterparts or to yams.
All these fit into my life because I like to be active and I like to exercise. I think a person following the primal WOF can do without, if they’re not exercising beyond what the PBF suggests.
I do think that being “scared” of these tubers/starches is a bit silly. In moderation, I can’t see them derailing people’s efforts to lose fat (which is what most of us are after) and may even help if “used” properly, as in, post workout mostly, as a way to replenish glycogen stores in the muscles and have them be ready to lift another day.