> Who said that time needs to be in sync with rotation of the earth? Nobody, who cares?
Humans sleep, usually at night time, and the rotation of the Earth defines night in any location, so regardless of the continual tick of some sort of "universal clock" we need a way to measure daily events that humans can use that rely on the sun going up and down at certain times and thus we need to adjust our local Earth times based on it's rotation.
Maybe we can decouple UTC (or whatever) from local times completely, so then a leap second is just a second we add to or remove from the offset for any given location, but we still need to deal with adjusting local clocks to the rotation of the Earth and it's orbit around our star, the "Sun".
Sleep is not influenced by a second before or more. And I never understood this, it's far simpler to adjust the time you wake up/go to work/go to bed/whatever than to adjust the clocks.
These solutions (including daylight saving time, timezone, etc) were probably a good solution where the clock were local and it didn't exist the problem of synchronizing clocks all around the world. But to these day, it doesn't really make a lot of sense sense. Even timezone, it would be far easier knowing that there is only a world clock (UTC) and we adapt our time to the clock and not change the clock.
Timezone, daylight saving, and leap seconds generate a ton of problems only for a minor convenience...
This seems like a kind of navel gazing point, however-- without leapseconds it would take on the order of 4000 years to slip an hour, quite a big longer so that nights hours aren't aren't at night.
We already have a good mechenism for matching local sun time-- timezones.
I don't see anyting in your post to justify one second level offsets.
(aside, UT1 is technically defined in terms of earth's orientation with respect to distant quasars, not the sun :) )
Humans sleep, usually at night time, and the rotation of the Earth defines night in any location, so regardless of the continual tick of some sort of "universal clock" we need a way to measure daily events that humans can use that rely on the sun going up and down at certain times and thus we need to adjust our local Earth times based on it's rotation.
Maybe we can decouple UTC (or whatever) from local times completely, so then a leap second is just a second we add to or remove from the offset for any given location, but we still need to deal with adjusting local clocks to the rotation of the Earth and it's orbit around our star, the "Sun".