I'm just wondering about this. By using “must” over “may”, aren't we going to say “must (a), must (b), and must (c)”? Or do we want “may (a), may (b), and may (c)”? To me, I think if we're trying to put in legislation to make sure those things are done, then “must” says they must be done.
On November 15th, 2016. See this statement in context.