And that's where the game part of Role-Playing Game comes in. In fact I find MUDlikes to be the least immersive of these games, specifically because the code overrules the situation, but it's a fun part of a game. Full ANSI art is not immersive to me, but man it is fun.
@faraday and I were just discussing how code can easily push you out of immersion in situations where you have to stop what you're doing to remember the "IC" way to do things, when you have other methods already in your culture and the culture of most the people you're playing with. That isn't fun, and so it takes you out of the frame of mind that immersion is meant to bring you into.
So...yes. That.
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edit, because of this thought:
Immeserive: Day/night cycles on games with vampires. But this was so annoying for so many people for so long that I personally celebrated the day that we stopped this. Now a scene is any time of day you want it to be. Someone might be able to tell that you're playing a vampire from that, but that information was never as secret as anyone wanted it to be. Now the onus is on the players to not abuse the knowledge, something supported by the current culture, and I hope always will.