I would love to run TAI on my devices. But where can I find a public NTP server that offers TAI, or a GPS module that gives the same? Do these exist? Or is this the wrong approach?
So while you can design software to record things in TAI, and if you build your own hardware and firmware use TAI on that hardware and firmware... at a normal day to day level you can't really switch... but you can join the slowly growing collection of educated and aware people that appreciate the UTC/TAI mismatch in our software systems and push in the correct direction. The arguments about freezing UTC and not adding any more leap seconds to it are on the face of it, just stupid, we have GPS time which is fixed to TAI, we have TAI itself... we don't need to fundamentally change UTC just because we fucked up all the computers but just don't want to fix them properly. This is one time where counter to the Simpson's meme, the children are in fact wrong. UTC is harder for the computers to use, and that's because UTC was the wrong choice, so the answer is to stop having the damn computers use UTC as the internal time representation and switch to having them use an appropriate internal time representation.