“East Coast” doesn’t provide enough information. If you look at a map of America and draw a straight line south from the western end of Massachusetts, it doesn’t really touch another state at all, just the ocean. What really needs to happen is that the Northeast needs to be in a different time zone, and then we stick to standard time. But as it is now, it really sucks being in EST in the winter in the northeast, which is why so many of us prefer permanent DST, when given the choice without the option of being in a different time zone.