This is a neat little helper to make worldbuilding more intuitive. The biggest obstacle will be people who go "oh no I can't draw" and refuse to do the 5 minute sketches, especially if you've got that one guy in the group who can draw movie-quality concept art within that time.
I suggest adding "discouraged" in between encouraged and banned concepts. Discouraged items should be very rare and are not day-to-day occurrences. They're things most societies in the setting consider sacrilegious or impossible, or which are heavily persecuted, even though they technically still exist.