It's possible that it could have done both. The Blue line already curves toward the airport before curving away to the Airport stop. If they put a stop at Santarpio's, had it go under the East Boston Memorial Park to the airport, and loop back to stop either at the current Airport stop or a new stop just east between Putnam and Prescott, that would give really good neighborhood coverage while also hitting the airport.

There are definitely ways where it could serve both.

Even if you don't like the detour to Logan, the Elizabeth Line in London has some trains go to Heathrow and some not. If we could rewind time, maybe instead of building the Silver Line and the Ted Williams Tunnel, it would make more sense to have the Blue Line have two different terminuses. One leg terminates at Logan and one leg goes to Wonderland.

Burying I-93 was really important, but maybe public transit could have gotten more love and we could have put a bit less into the highways.