almost every interesting and valuable talks are in local chat. pirate vs. trader, player vs. player, even simple 'hello', all this are in local chat.
In the system, you can hear one-sided dialogs - one player uses /l and another not, so, it has no sense, you can hear // ooc chat. etc. I say 90% of RP is in the local chat.
This idea doesn't turn off system chat, you could use /s and say what you want to system. But it would be intentional, when you want to say something interesting to all in the system.
