I can tell you that Transport Canada has been looking at the headlights issue for over 10 years. Their technological or technical argument is about the glare that those headlights could cause. However, the same lights exist in Europe, but the department will tell you that the road conditions are different, the roads are faster, narrower or wider there, and that, based on a number of criteria, what seems to work there may not work here. In addition to that, there is the issue with the U.S. regulations, which, for the time being, prohibit the coming into force of this technology.
On September 26th, 2017. See this statement in context.