I guess just having split my time between New England and Utah over the last 2 years (From Killington down to Boston) there really just aren't that many Tesla's in the area yet considering it's size. Utah is the size of New England and has 1 (soon to be 2) service centers, yet we have more than double the number of Teslas in the same area.
South of NH it's picking up steam fast though, especially in southern New England, (CT down to NYC).
Then again while I felt Utah has an outsized Tesla presence compared to New England, visiting the Bay Area opened my eyes quite a bit. Felt like every 4th car around SF was an EV.