>"The health evidence points to standard time, largely because morning light matters for our body clocks, sleep, and mood."
That entirely depends on where you are and when you wake. For many people, being forced to adjust to a time change twice a year can really screw with sleep a lot more. Some people take weeks or longer to adjust.
>""Our biological clocks need morning light to stay synchronized with the 24-hour day," said Simon Fraser"
And in the winter, where I am, it is still dark in the winter when I wake most of the time, so it never really solves that "issue", if it even is one. The difference is that with permanent Daylight Saving Time, it would not be dark when I return home, so I was have at least some daylight I could actual use after work. And if necessary, I could set a timer with bright full-spectrum lights each morning before waking in the winter.
Again, it depends primarily on your location and latitude and when you must awaken. Which is why the best idea is to allow States (or in this case Provinces) choose what they want to do for themselves:
1) Stay on Standard Time permanently
2) Stay on Saving Time permanently
3) Change time twice a year.
What is right for Maine isn't necessarily the same as for Virginia or Florida. They have very different latitudes. They can experiment and see what is best for THEM, rather than forcing the entire country into a single mode.
But if we can only have a single change/standard, I would vote for either permanent time option, rather than the insanity of switching time twice a year.