I agree with this. 100% mandatory outside of your home would mean I would have to wear a mask while running, which seems unnecessary when I see a grand total of 1 or 2 people on my entire run (and cross the street to keep plenty of distances between us).
This is one danger of applying a solution for 100% of everyone, everywhere without taking into account any nuances.
That said, mandating masks indoors + outdoors when you can't maintain 6 feet of distance seems like a no brainer. Perhaps in higher density areas it could be worth requiring them 100% of the time, even outdoors, but I'd like to see the data first.