Human beings are highly adaptable creatures, so it all depends on what you’re used to.
Taiwan doesn’t observe daylight saving time because we’re close to the equator so sunrise and sunset time doesn’t differ that much year round. But maybe daylight saving time makes sense for people further from the equator.
I think if China follows international standard, it would have 5 time zones, so I think having only one time zone makes life a little awkward for people in certain parts of the country. For some parts of Xinjiang, the westernmost region of China, the sun rises after 10 AM in the winter and sets after 10 PM in the summer; which is fine I guess if you’re used to it. Scandinavian countries deal with worse, although it's because they have no alternatives. I read that some people in Xinjiang choose to follow their own local time instead of Beijing time because it’s more in tune with nature.
I think all things considered, it’s better to have multiple time zones if a country is spread across wide longitudes. Most people don’t travel across time zones enough for it to be a hassle, and you know to adjust for it when you call someone in another time zone.
When I was a kid, I was confused by the time used in national TV commercials in the US. Like what does 9/8c mean? Now I know that it means if you’re in the Central Time zone, the show starts at 8, and if you’re in the Eastern, Mountain, or Pacific Time zone, the show starts at 9.