The main reason I hate score match is because it has by far the biggest opportunity cost of playing the event match instead of normal songs. With token events you're playing normal songs all the time, so it counts towards song goals, and you can use random to get box points faster. Medley and challenge festivals have ways to boost your G/exp gain and rare reward drops, and medleys are actually more LP efficient than any other mode. Score matches? No friend supports or boost, no special rewards, no counting towards any goals. The only long-term thing it contributes towards is filling the points box, and before 4.0 it didn't even have that.