I mentioned this in the TVtropes thread, but Merlin did not think through his interdict all that well - If you are going to compromise everyones mental integrity to end a cycle of magical destruction, then limiting information spread is an asinie way to do it - it would make infinitely more sense to subject all wizards to a magical prohibition against large scale destruction and killing. Phrasing it so that it wards agaist Dunning-Kruger fueled magical accidents without shutting down experimentation entirely is an interesting exercise, but should be possible.