No but the sports referee perhaps specializes in one or a few games/leagues. And at high levels, a referee role is probably similar to physician/lawyer where y

No but the sports referee perhaps specializes in one or a few games/leagues. And at high levels, a referee role is probably similar to physician/lawyer where you'll have annual rule updates/changes, jurisprudence history of past rulings, and conventions/associations of referees where they will be spending money, time and effort when not on the field. Now multiply the referee's game or league types by everything in /usr/bin