[9192631770_Hz]

Local noon is measured by meridian passage (a line) and not just the zenith (a point, directly overhead). I assume that is what OP meant...have clock noon be close to local noon. It’s a complicated issue, particularly long term, for example, where it then bumps into the move to get rid of leap seconds.

[mongol]

Exactly. The usual timezones are set up with the general intent that 12:00 is close to the time when sun is at its highest point in the sky. That is how our time historically was calibrated and I don't see why that needs to change if daylight time is abolished. It is a good reference. What else would be a better reference?