Oh, how did I miss this? You are picking on a game because of a little fault like this? Now that's just petty. It's like saying you didn't like Mario because the pipes were green.

And again, it comes back to what you were saying. The games you listed all fall into general categories, with some falling a bit further from the tree than others. MGS is just doing more of the same. It probably branches out further than many, due to all sorts of little features and idiosyncrasies that make it what it is. Games these days need little features like that to make them stand out in the crowd. To make them different. Sure, they could have not included it and just made people hide normally, but putting it in adds character to the game... While you obviously weren't impressed, many people were, and will remember things like this and add to their overall impression of the game.