That's my point. A lot of people have no control over the hours they work. They get set hours with no flexibility in start/finish times. Itis all very well to say "just go in an hour earlier", but the majority of people can't that. If the whole country is going to get up an hour earlier, public transports has to start an hour earlier. Schools, Colleges, shops, Government offices, GP surgeries, factories etc. etc. will all have to open an hour earlier. We might as well just put the clocks forward an hour.
Who says that a business has to start at a certain time, when it makes more sense to start later or earlier in the day.
As for transport, if the demand is there, they will extend their operating hours, it would have the bonus of reducing "rush hour" congestion.