[avemg]

Why only sort of? What could be easier than than a time reference that's constant across the planet, doesn't observe daylight savings, has no leap years (but rare leap seconds, iirc), and can be trivially converted to a local time if necessary? I guess never having to convert to local times because there's no such thing in the world as time zones would be easier, but at the cost of all of the practical everyday uses of local times.