[exporectomy]

It's not as simple as UTC everywhere. If you're representing a fixed point in time, independent of any local time, then yes. But sometimes, a date/time is relative to the local time zone and in those cases, the local time zone is the correct one to store it in. For example, scheduled times for future events in the real world such as appointments. You can't store it as UTC because you can't know what the time zone offset will be in the future since that's a political decision.