As long as you’re drawing from a wider pool of supply, the more options you have to draw from, the better a fit you’ll be able to find. Even if the overall imbalance between supply and demand remains constant. When you can choose from a wider array of towns, you’re more likely to find one that is allowing enough development for you.
Just look at the numbers provided. Pittsfield prices go up 80% in 3 years, while Brockton prices have only gone ip 50% in 5. That a 26% annual growth rate vs a 10%. That makes Brockton a veritable steal.