That's because for a great many purposes, doing things the way everyone else does them is an extremely big benefit. If your operating system uses UTC, your log

That's because for a great many purposes, doing things the way everyone else does them is an extremely big benefit. If your operating system uses UTC, your logging library uses UTC, your SSL cert issuer uses UTC, your TOTP tokens use UTC, your NTP client uses UTC, your e-mail headers use UTC, your string formatter uses UTC, your serialised data parsing libraries use UTC, everyone who sends you data uses UTC, and everyone you send data to wants to receive UTC - why swim against the current? How do I know this? Because I've tried it. Let me assure you, for every bug you avoid using TAI, you'll experience 500 bugs due to UTC/TAI confusion.