But then you need to change the working hours for their co-workers who depend on them. Then some of the business partners of the companies that have a large number of employees that changed their working hours.

Eventually we get right back to where we started. The reason we change the clocks is because we decided that as a society, parts of the world that have a significant angle to the sun (which have a limited amount of daylight in the winter, and an excess amount of daylight in the summer) so we came up with a system to deal with that fact in a fairly organized way. There won't be a good solution to this, but simply changing the clocks twice a year is probably the least worst of all options.