I can only speculate what's going on.
I wonder if the legalization of recreational use and the decrease of our resistance in terms of using marijuana have influenced the physicians' opinion of using it. You can buy it anywhere, and it's not a prescription drug, then it must be safe, or safer. I think the threshold of ours to balance whether we should give it or not becomes less strict. That can probably partially explain why it's going on.
I don't think there is any evidence shown for the last two years to say that we have reasons to change this attitude. That's just my speculation.