Hmm, I think I’m going to say Neutral on this one.
I see ways how this feature could be useful, but then I think that it totally isn’t necessary.

I’ve noticed many players just write ‘afk’ or changing their nick to ‘Username_AFK’, for example, so this unique way, shall I say, can still be used.

We staff have this command as it tells other players that we aren’t just ‘ignoring’ them or choose not to ‘talk’ to them. We are simply busy at that moment in time. When we no longer become afk, it tells the players that we are available to help and assist them as we are no longer busy. Comparing this to normal players, it’s not really necessary or a big deal.

I like the idea of that afk message popping up whenever a player messages you, however.