Exactly. Changing an entire culture is hard, so you just change the clock. People naturally wake up at some delta from sunrise, so it's inconvenient that we have set times to do things that aren't set based on time since sunrise. Of course the sun rises at different times everywhere, so it wouldn't be very convenient to say that we were going to have a conference call at sunrise+3 hours, when that's not a consistent time for both of us.

Instead we just approximate the correction with a one hour step function every year, and everyone is coordinated on it automatically. If a few programmers have to use more complicated date/time functions, it's a small price to pay for everyone to be able to keep their bodies on a more natural schedule.