The trouble with 5 X 5 in church gyms with old men is spacing and there is so much defensive/rebounding advantage to parking the old fat balding guy in the middle on D that it ruins the flow of the game. 4 X 4 opens it up, evens out the offense, allows for drives/dishes/jump shots while still allowing the chuckers the chance to heave away. Makes the defense honest, too. Games are more fast-paced and exciting.