I've literally heard nobody say they want it to be 12.00 and bright out when they eat lunch, only that they want it to be bright out.
Suppose we set the universal time to the current -12h meridian. Everyone works with that exact same time. If I receive a scheduled meeting at 15.00 I know exactly when to be there (wow, that's late for me!). If glance at the clock and see that it is 4.00, I know it's time for my afternoon tea, and that the sun is still out.
I think people would get used to this line of thinking very rapidly, and would scheduling would be arguably made easier, because the proposed time would not need to be parsed by anyone.
Your comment makes me understand why people would want to abolish time zones. However, my issue with that is that I think it would cause confusion when people in everyday life use the word “afternoon”. I won’t know if they’re talking about the time when the sun is getting lower in the sky, or if they are talking about when it is past 12:00 on whatever clock we are mandated to read. We would all need to ask people to clarify those things, especially if they don’t have the detail-oriented mindset for these kinds of things. Now, granted, you do already have to clarify these things when you are speaking with people around the world already.
Like having to coordinate meetings around the world or figuring out what time it is for their friend on the other side of the world. Most people never deal with any of that. They just want it to be 12:00 and bright out when they eat lunch (or whenever they eat lunch).