Yes. Again, I think there's a perennial “may” versus “shall” debate on many issues. I'll perhaps invite Michel to comment on that a bit.
Again, the idea was not to be able to ignore certain factors. But there may simply be situations where certain factors are not relevant. For example, with regard to the fact that the offender is incarcerated in a very developed country with comparable standards of prison conditions, the factor simply becomes irrelevant and there are other factors that warrant more attention by the judge. Similarly, the offender may be in very good health and it's just not a factor that warrants much consideration. The idea is not to ignore things, but rather to be sure that the minister is focusing on those factors that are most relevant.
But on the “may” and “shall” question, I wonder if Mr. Laprade would like to comment.