Reminder that a few hundred years ago when clocks were oddities we didn't have to deal with any of this madness because everybody used True Solar Time as a sundial would read it. What time do kids go to school? After the sun rises. Simple. Now that we have clocks it suddenly becomes difficult to schedule simple things like sending kids to school in sunlight.
Once we invented the railway we quickly realised that Oxford Time and London Time being 6 minutes out was not helpful. That was 180 years ago.
While true, I'm not sure what your point is? Centuries ago, everyone got up at sunrise to tend to the farm because the farm needed tending at sunrise. These days, organizations like schools and grocery stores need to coordinate with hundreds to thousands of people daily, and "angle of sun in the sky" is nowhere near precise enough. Let alone phone calls and instant messages that travel across many timezones.