Why the Hell do people want Level-sync?

You can rank from 1-50 in aprox 2 Weeks now. So why would you need it at all? It doesnt matter if you are Level1 or Level50, you will get tons of Exp if you go with a PL'Character to a certain Area. So the Sentence "I want to level with my friend", doesnt make sense anymore and just looks like a silly excuse to me.