You are right, and whenever we drifted by 1 hour (or whatever is deemed too much) we can just update each time zone in the TZDB to be different by that amount o

You are right, and whenever we drifted by 1 hour (or whatever is deemed too much) we can just update each time zone in the TZDB to be different by that amount of time going forward. This shifts the problem from a basically unsolved one (with how no OS properly supports TAI) to a solved one, time zones. You could even align it with a DST transition in countries that have those where you simply skip one to apply the change.