At the same time, it's good to have some 'central planning' since this gives motivation to contributors and makes them feel part of "Arc's history" (not that reading Arc's forum is not engaging enough, but...), otherwise they may feel that their work is not appreciated and just stop hanging around...
As much as everyone wants freedom (as in speech not beer) it's not so much fun when your working code is on the line. Even in a 3-week old experimental programming language. Funny that.