To me it feels like redefining the meter to make it better for some particular purpose. For example, it is defined as the distance light travels in 1/299792458th of a second. Why not make it an even 300000000? Or make it perfect to measure say the width of train tracks?

There is value to stick to a historical tradition which is easy to reason about. I like the connection standard time has to the course of the sun. It makes a lot of sense. It serves as a reference. Time does not say when you need to do something. It is up to you and the people around you. Time is just the way you communicate about it