The general concensus among the development team is we do not want to introduce a way for a player to mute/ignore another player's main chat. Asking different people in the development team may yield you different reasons, many of which I agree with too.
With that being said, I do recognise that when the chat goes really fast, eventhough it isn't always the case, it can be really easy to miss messages for various reasons. So while, no, I'm not adding /ignore, I am looking into the possibility of adding a way to either make the colours of the messages more distinguishable or adding a seperate chat GUI that can be enabled/disabled by the player for only roleplay commands.