Nineteen states have passed legislation to make daylight saving time permanent. But those laws won't take effect until Congress makes it legal. And the medical community sees one major problem.
I mean you're not wrong, but its also a larger societal thing which ends up meaning government who negotiates such things. Its not just work, but school start times and bus schedules, public transport times, parking fees/times. It balloons out a bit, so its easier to have some official stance. However, it doesn't have to be federal, and could just be local municipal governments.
In general, though. Yes, individuals could just shift what they do, and this is exactly what humans did for a long time. The industrial revolution changed us so that we needed to coordinate and regiment societal schedules, and here we are now.