Most people have a fixed work schedule. If you work for Walmart and the store opens at 8 AM, you can't arbitrarily decide to wake up at 8AM because that's when the sun rises.

Most people start work at 8-9am and sunrise is well before that with plenty of time for commute with or without daylight savings.

There is another much smaller cluster of people who start work at 4-6am because they're in transit or service industry and they are before sunrise either way.

To get to work at 8AM, you can't wake up at 8AM. Sunrise often occurs around 7:30-50AM in northern latitudes even in ST during December and January. With DST, this would mean sunrise occurs at 8:30-50AM.

Not during the winter if this change goes through. In much of the northern US, sunrise won't be until after 8 am on many days.