Boston is a great example of an environment where studs actually work against you. You drive in mixed conditions all winter, that can include fresh snow, packed snow, slush, rain, dry pavement, and yes, some ice around intersections, or after a freeze/thaw cycle. It does not look like a race track made from perfectly flat, consistent, polished ice.
Given that studs only help on bare ice between zero and 32 degrees, do nothing in snow, get in the way in slush, and on wet or dry pavement, I'm sure you can see why using them there, instead of a tire literally designed for your exact situation, would be a bad idea. Particularly given that studs damage roadways, resulting in increased air pollution and a greater burden on taxpayers whose money funds road maintenance.
Studded tires sold today tend to apply studs to the same kinds of winter compounds you'll find on studless tires. So why not use such a tire (studded + winter compound) and gain the best of both features? Three reasons: noise, road damage, and value. In today's world, studded tires are designed for Scandanavian roads. It's not that their winters are that much more daunting than ours, it's that in the northern parts of Sweden/Norway/Finland/Russia, they don't plow roads. In the winter there, you mostly drive on compacted snow, and probably across some frozen lakes too. You'll only really encounter bare pavement in a town center. In contrast, roads in North America are plowed. Even up by our cabin in northern Montana, on the Canadian border, the state plows the main roads. Even when we drive there in the depths of winter, we mostly drive on bare pavement, then encounter only a few miles of challenging, snowed-in dirt roads, or encounter a storm for a portion of the trip. Running a tire that isn't designed to handle bare pavement is a bad idea in a country that's mostly bare pavement.
Even if your'e the kind of rugged individualist who gets mad about participating in civil society, and so doesn't care about population-level health or budget concerns, then you still have to accept that running studs in an environment they weren't designed for represents poor value. Studies show that driving on pavement with studs for just 1,000 miles wears them down so much that their braking distances on bare ice (again, the only condition where they do anything useful) increases 12 percent. Everyone in North America is driving on bare pavement for at least 1,000 miles a winter. If your studs are more than a season old, they are likely so worn that all they're doing is making noise. You paid for tire that may still help in cold weather thanks to its compound, but all it's giving you over a modern studless winter tire is a headache.
All that, and studs can no longer be demonstrated to reliably outperform modern studless tires on bare ice. Obviously there's a lot of different tires out there, and one might grip better than another in a certain test, but as a category, studs are now obsolete.