Nothing is stopping them. But that doesn't go far enough. I work on software that, among many other things, calculates durations between local times that have

Nothing is stopping them. But that doesn't go far enough. I work on software that, among many other things, calculates durations between local times that have been recorded. DST is a constant thorn in my side. And no, I can't "just use UTC". To be compliant, the software must accept input in local times. If it's possible to shift working hours (which it is), then what is the purpose of DST anyway. I'd rather trade the one-time cost of eliminating it entirely than reliving the same mini-crisis twice a year. The upside of DST is nothing but inertia.