My point is, Timezone-Names alone are not completely reliable. They only name the location, but not the political or historical situation of this location.
Take Europe/Berlin for example, the city was once divided in two parts, and is now in a country which is changing timezone twice a year. With a location, you can only communicate to use the rules valid today, not rules which were valid at some point in the past, or which are valid today, but in a different situation/context.