There are very few systems that care about second-level time that leapseconds don't cause issues for. They are almost universally mishandled by widespread syst

There are very few systems that care about second-level time that leapseconds don't cause issues for. They are almost universally mishandled by widespread systems, so much so that we even get multi-million dollar scale internet disruptions due to leapseconds when there hasn't even been a leapsecond. I doubt anyone talking about the elimination of the leapsecond is unaware of TAI but TAI is not readily available on general purpose computers (and, increasingly, UTC is being silently substituted for leap-smeared UTC). And for specialized systems attempts to make pockets of TAI break down when they have to talk to the outside world (and have consistent times with it) and/or due to hardcoded leapsecond tables in software.