I also don't consider the laws in question to be of any appreciable difference over what the current status is.

If there is no appreciable difference, why is a change being sought?

To codify existing practice. We don't use GMT any more, we use UTC. It isn't even clear that with the closing of Greenwich observatory if GMT even exits.

By seeking to replace mean solar time as the foundation of U.S. civil time, there is a tacit admission that UTC may subsequently not remain tied to mean solar time.

Well, we *don't* use mean solar time as the foundation of US civil time anymore. Not even USNO runs transit telescopes to take sightings of the sun. I consider the current situation as one where the laws don't match practice, and don't see any problem with updating the laws. To be against the proposed updates of the law on the basis that UTC in the future *might* not include leap seconds seems overly paranoid to me.

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