Good for them, though I’m a bit surprised. The road may be designed for that speed, but the environment isn’t. There aren’t many areas in Mass where the highway is level enough, and the sightlines are long enough, to justify that speed. Too, Mass has a fairly high deer population, and they do get out onto the highways, so the higher speed will make it harder to avoid them. Maybe the stretch of 90 from 91 through to 495 will work, but I can’t think of anywhere else where the higher speed would be really needed.
Beyond that obvious fact, many drivers are not capable of much over 55-60 mph. Lousy reflexes, poor eyesight, abysmal decision making skills.
Have advocated for decades, licensing tiers based on real world physical capabilities. Never happen of course, half of southern Florida would possibly lose the right to drive.