To be fair Boston city roads are like horse carriage routes that were converted to streets and will probably one of the last places FSD optimizes for.
To give you an idea of the incredible features in some cities, I have recently driven in Rennes where they found a good idea to makes roads with one single central lane for cars with wide bicycle path on each side. You are supposed to drive in the center and if a car comes in the other direction each car needs to go on the bicycle lane on their respective side of the road while giving priority to bicycles. I wonder how FSD would handle that...