I'm not sure why the system went the way it did bur it makes sense and it's not like it's hard to get 3 judges together. In England they still use the referee to score the fight a lot but in the U.S. it doesn't really happen. I'm sure it's a work of the commissions and TV networks to ensure better decisions because I know in the 40's there were quite a few referees paid off who scored the fight wrong. It's a lot easier to pay off 1 then 3.

Again these are just theories and maybe I'm off but it makes sense.