These two states are examples of states where it is "easy" to do your own thing. Arizona and Hawaii's metro areas do not bleed over into nearby states.
It'd be tough for New York, for example, to abolish DST without New Jersey and Connecticut doing the same, you'd have people crossing time zones part of the year in their daily commute. Then, it would be hard for New Jersey to do it without Pennsylvania (where many New Jerseyans commute to) also following suit. Likewise in New England, where Boston is the center of the universe, all of New England is best off being in sync, you don't want commuters from New Hampshire and Rhode Island to cross time zones to get to their jobs in MA.
It'd be tough for New York, for example, to abolish DST without New Jersey and Connecticut doing the same, you'd have people crossing time zones part of the year in their daily commute. Then, it would be hard for New Jersey to do it without Pennsylvania (where many New Jerseyans commute to) also following suit. Likewise in New England, where Boston is the center of the universe, all of New England is best off being in sync, you don't want commuters from New Hampshire and Rhode Island to cross time zones to get to their jobs in MA.