As a recipient of the extremely temporary favor of the gods which created conditions for New Hampshire, as it is, to exist, I can say with total certainty: New Hampshire is/was a bait-and-switch of a state existent solely upon the failure of Mass to build enough housing. You had cheap real estate in the 70s-90s luring people over the border to raise their kids more affordably; you have expensive education facing those same people, now and for the past three decades. "Come here for cheaper living", while providing almost zero job opportunities that didn't piggyback on Boston's inherent strengths.
Now that it's been "built out" to the extent that very generous single-family zoning allows, there is no path forward for the state that doesn't ultimately rely on even greater dependency on Greater Boston. The passion with which the commuter rail there is resisted is proportionate to the extent to which NH pols know that this is the case. New Hampshire is, for all intents and purposes, a parasite state to Massachusetts' policy failures. As soon as those are fixed--far more than Vermont or Maine--I don't know why anyone would live there, said in all deference to my own nostalgia for it.