Could you imagine, then, without DST, the sun would set in Boston at 7:25 p.m. in the third week of June? — which is the latest time it sets for them.
Boston is in the same time zone as Fort Wayne, Indiana. Today, the sun will set about 57 minutes earlier in Boston than in Fort Wayne. It doesn't matter whether or not we use DST; I'd make the case that these two places probably shouldn't be operating on the same clock.