Why console command have bool callback?

 public void AddConsoleCommand(
      string command,
      Plugin plugin,
      Func<ConsoleSystem.Arg, bool> callback)
    {​

Chat commann meanwhile

public void AddChatCommand(
      string command,
      Plugin plugin,
      Action<BasePlayer, string, string[]> callback)
    {

Also @Calytic, does developers forum section disappeared? 

That would be a question for the original developer, who is no longer here; but those aren't really going to exist anymore.

The section was removed as it doesn't really have a dedicated purpose right now.