"Anonymous. If you are out of time you should not be looked at twice."
Timing is only one of several factors.
If you cast yourself as a single-issue judge, then what you basically say is you don't really care about anything else - smoothness, posture, partnering, etc - all irrelevant unless the couple achieves YOUR PERSONAL IDEA of proper timing.
For example, I would be quite hesitant to mark a couple who dances their foxtrot precisely on the beat, but does this by executing it with a character of movement that looks more like tango than foxtrot. If there were a couple next to them dancing with flowing foxtrot character but with less precise timing, I would probably place them higher, since they showing a better understanding of what the foxtrot is about.
"Will somebody else confirm that in the US it doesn't matter if you are dancing out of time in a competition."
Of course it matters. But it is only ONE FACTOR AMONGST MANY. All of which are important. Because it is only one factor, it is indeed sometimes possible for a couple who is "off time" to place ahead of one who isn't, if their dancing is better when ALL ASPECTS are taken into consideration.