But when you have that specialized need, it is easy enough to remember an offset. And less work for the handful of people who want that to look up the offset (which only changes every few years) than it is to expect every clock in every computer to change every so often.

The only people who really benefit from this are a handful of astronomers. But they are already used to keeping multiple clocks, and having them adjust their software programs is less work than having everyone else's computers reset.