I was mentioned in a comment on Google+, and ended up writing a little bit about game feedback as a result. So here it is.
The discussion was on the absence of combat logs (scrolling text windows showing you exact numbers for combat actions) in the new SWTOR MMO. Some folks regret the absence, because they use the logs to optimize what they are doing, and use it as a learning tool. Other players find them a legacy of the text mud days, or a feature that hastens the deconstruction of the entire system and therefore damages the fun factor.
Both sides are right, really. Combat logs are just a form of feedback. The more feedback the system gives you, the more information you have for the process of figuring out how the system works. This then makes the process of optimizing play easier (read that as “getting the results you want from a given input”).
The first thing to realize here is that everything the game shows you, really, is a form of feedback. The locations of chess pieces on a board, the “game state,” is a type of feedback. Numbers floating off the enemy are feedback; the glowy effect trailing a swinging sword is also feedback.
Some forms of feedback are better suited for certain types of information than others.
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