So here’s the logic underlying soccer’s rules: the game is supposed to scale down, so that an ordinary youth or recreation-league game can be played under the exact same rules used by the pros. This means that the rules must be designed so that the game can be run by a single referee, without any special equipment such as a scoreboard.
M. Rokicki, S. Chelaru, S. Zerr, and S. Siersdorfer. Proceedings of the 23rd ACM International Conference on Conference on Information and Knowledge Management, page 1469--1478. New York, NY, USA, ACM, (2014)