I still think the people that would benefit the most from this change are europeans. They are mostly borderless and often works across the member countries than spans 7 timezones, centered roughly around the utc. It’s all benefits with very little downsides.
It takes very little imagination to realize that this would not be an issue.
There are a whole loads of minor annoyances related to this, most of them would vary depending on the local culture. In addition to that, not all countries are sufficiently globalized to realize the benefits of universal time, especially 3rd world countries. People living in those countries will experiences all the drawback with none of the benefits in their daily live.