Could anyone tell me, why there is no crossbar on the upper side of the uprights in american football? It would make officiating difficult situations easier. Is there an engineering reason? Is it about tradition? I know that ball (american football ball :)) could fly to 100 feet but if it's beetwen imagined extensions of uprights than it's a good kick. "Upper" crossbar would solve those dilemmas.
Because there's no upper bound to a field goal being good (the line of the uprights extend upwards infinitely). You would be laughed at for even suggesting that there should be an upper bound on field goals. Also, field goals that pass just above the uprights are pretty rare to begin with.