UTC solves nothing for civil timekeeping, compared to TAI. Timezone bands are massive. If they were perfectly straight (they aren't) then civil time in any one

UTC solves nothing for civil timekeeping, compared to TAI. Timezone bands are massive. If they were perfectly straight (they aren't) then civil time in any one place would be off by up to 30 minutes in either direction, depending on the location. In reality they line up with political entities instead, creating even larger discrepancies (with the extreme case being China, where some regions are hours off). Compared to that, a second every couple of years is completely irrelevant.