With the NYC style signs, you it would be a nice final warning for me though at JFK that the next 5 stops are in Quincy and I better get off and switch to Ashmont. Just kidding - I would still notice after JFK and curse myself for the 20+ minute to my journey by going to North Quincy and back.
Yeah, the Red Line does have some (small) case for something like that, given the branching, though I don't think the cost-benefit analysis is going to come out in favor of electric maps given the limited series of instances where it'd potentially make a difference (though some of that is me projecting based on some of NYC's electronic maps on the shared cars that are way less intuitive to read than they should be). Most of my pessimistic take on the utility of electronic maps came from the fact that the topic came up in discussion of the Orange Line, which has
no meaningful case for electronic maps. Red's is small, but on the OL they'd just be one more thing to break (and, this being the T, they absolutely would break).