Your argument can be uses against any changes in any area whatsoever. Even against dropping DST - "our brain and body has been synced to" light summer nights, dark winter nights, so we can't change that! It also depends on how you handle the situation. Norwegian farmers blame the cows: Tomorrow morning (DST starts this night) they simply are not ready for being milked at the ordinary morning milking time, at 5am! The farmers insist on doing the milking at wall clock time 5am. They could have decided to "delay" the milking tomorrow morning, doing it at 6am - the sun would be as high on the sky at 6am as it was today at 5am, and the cows wouldn't notice that it is one hour later. But the farmers refuse to do that - then they would loose one essential argument against DST. Your "brain and body has been synced" to the sun, not the wall clock! If your wall clock stops, your body goes on. If the body went by wall clock time, jet lag would be a non-issue. The wall clock time of dawn varies by quite a few hours over the year, but your body reacts to the dawn, not to the wall clock. Or ... Your body probably reacts to your alarm clock, but that is to the alarm, not to the dial. It really doesn't matter if the dial says 7am or 14:00 - you wake by the alarm, not the dial. Actually, switching to UTC would be simpler in the US than e.g. in Norway. It wouldn't happen overnight; there would be a mix of 'old' and 'new' time. In the US, the difference between the two is so large that it would usually be quite obvious which scale you are on. Any hour > 12 would obviously be 'new' time, any 'am' or 'pm' would be 'old'. Here, the risk of confusion is much larger: 24h time has been commonplace for more than fifty years. We never used 'am' and 'pm', even with 12h time. The change would be only a single hour (or two, with DST), so the risk of confusion would be large during the transition period. Yet I think it would be worth it. (But I am not holding my breath for it to happen ...)
