Interesting. Did you try comparing it against anything other than a Pixel 2 by any chance (to rule out the Pixel 2 just being worse than better L1 phones)? And have you tried it in the city to see if L5 is any help there?
Previously on walks around the neighbourhood gps tracks would just be a general location and bounce around. I can now see pretty regularly which side of the street I was on, street crossings, etc.