ZD, I never tried it. Potato starch is used for chometz-like pastries, which is probably the reasoning behind the Chayei Adam cited by Sam, but as I mentioned, it’s not as simple as that.
ROB, taaruvos is my way of expresing how people oversimplify hilchos kitniyos, which you just did again.
You need not be machmir on all of the shailos; that’s fine, but you shouldn’t make fun of those who are. There are real shittos about this.