Sundials are already ‘wrong’ according to solar time by 30 minutes or more, as an artifact of dividing the world into hour-wide time zones.
Astronomy already ignores leap seconds in the same way that modern finance ignores half-crowns and shillings.
Astronomy already ignores leap seconds in the same way that modern finance ignores half-crowns and shillings.
To explain a bit further: UT1 tracks the Earth's rotation relative to distant quasars and is thus directly the correct clock/reference to use for pointing telescopes. However it doesn't advance at a nice and stable constant frequency, but something that slowly changes over time (and can shift by strong earthquakes) and thus we approximate it with UTC, which runs at a nice constant frequency, but needs occasional correction to match up with Earth's rotation.
Changing to TAI means you are different from everybody else, and still have to fool with leap seconds to know what everybody else is using. Worst of all worlds.
(Except Google smearing, which is even worse than that.)