Time zones were invented to reduce confusion

It can be inconvenient if you've missed a telephone conference because you forgot that 9:00 a.m. in Chicago is 7:00 a.m. in Los Angeles and 10:00 a.m. in New York City.

Time zones are supposed to keep our clocks consistent with solar time wherever we are on the planet. Solar time changes as you move even a short distance from one place to another. It was invented to help reduce confusion rather than cause it.