"The fact is modern track and field has a rich history in Imperial units and the traces of it are still all over many events from the obsession with the mile to the high hurdles being 42 inches tall and exactly 10 yards apart or the the shot put being exactly 16 pounds, even the pole vault plant box is exactly 8 inches deep, we could go on and on. Heck it was a big deal when the first guy broke 8 minutes for two miles, and multiple attempts were set up to make it happen in the late 90s. What metric distances have gotten that kind of excitement in recent history?"
When was the last time the olympic games used imperial units? Crickets....
USA, UK, and some other UK colonies had a imperial units all over many events. It was a big deal when 7:30 was broken, 13:00, 27:00.
It might have made sense to use the 1600/3200 from the beginning. Tracks are 400 (or 440). 1600 is four laps. That decision, though, is long gone. No one else in the world runs 1600/3200. Why, when you are going to metric, do you pick distances no one else runs when you are making that decision almost 100 years after it was made.
It's just stupid, and every knows it.