Of course, you're referring to 110M high-hurdlers. I stood next to Edwin Moses once at Disneyland. He was maybe 6'2" or so, but his inseam must have been 37-38". All legs. God just made him to be an intermediate-hurdler. Most extreme example of that I've ever seen personally.
Yes, I sometimes forget there is a 400 meter hurdles. I could not have run 400 meters in under a minute much less the 400 hurdles.
For a long time Moses totally dominated the event. I remember watching him and noting just how easily he stepped over those intermediate hurdles.
IMO the 400 meter hurdles is probably the most difficult event in track.