Among other things, children. Sure, I might be able to get up earlier, work earlier and leave when it's still light, but I still wouldn't have much time to spend with my kid during daytime.
Another example: bus frequency. You know, small stuff that adds up ;)
If shifting the timezone by an hour is a solution, then so is just shifting work hours by an hour. How do children change anything?
There may be other, poor, reasons, that it sucks for you (like other people insisting on going by a certain clock time) but I don't understand the children part.
the point is that business and school hours can be (and are) different in different countries. You can either change the timetables or the clock. To change the former requires more coordination throughout the society, hence we move the clock.
Another example: bus frequency. You know, small stuff that adds up ;)