The locations chosen for Tesla service are likely determined by prioritizing vehicle density versus larger regional customer convenience. Compared to three years ago, southern NH appears to be overrun with Teslas. Plenty of anecdotal evidence. Just last week, found myself in a parade of 3 Teslas on a rural backroad in Amherst. Since Tesla can see where all vehicles reside, Bedford is likely well positioned to serve a high concentration of cars between Concord and Nashua.
On a side note, among other areas hoping for immediate service relief in New England... north central CT is certainly hurting. It's not for a lack of trying on Tesla's part. Last year there was the debacle stirred up by East Hartford/ Hoffman Auto Group, putting the kibosh on that deal. Just this summer Tesla folded their tent on a service center proposal in South Windsor. Blame the usual suspects...CT Auto Retailers Ass. (CARA) and local town officials.