In simple terms, yes. It'll mean less confusion and aggro. It'd mean this thread would never have existed because they'd have said, "Tomb Raider is a timed exclusive," and no-one would have misunderstood that to mean it was 'taken' from their platform and be ranting to get the game 'restored' to their platform.
The message is essential. You may think you don't care what MS say as long as they deliver, but I doubt that's entirely true. If they went on stage next week and said Live was going up to $500 on 1st January in 2015, but then in 2015 keep the price the same because they were only messing about, would people be out of order to complain between now and the end of the year that the price is ridiculous? Of course not. Human beings have the unique capacity to consider our future. We don't have to wait until the future becomes the present to understand it and form opinions and choices in action. However, to do that well we need correct information, and incorrect information therefore doesn't go down well.
For MS as a business, they need the consumers to trust what they say when they try to produce a product/service people want, which means communicating in a way these people understand. That's pretty rudimentary business practice. It's the basis of all marketing, forming the right message and conveying it correctly. That's what your product is judged on first long before anyone owns it. It's the message that convinces people to buy the product, at which point it's the actual product that matters. MS could make the best console ever, 3 TF of Awesomeness, with the most intuitive UI and most comprehensive set of features ever, sell it for $200 with multiple free AAA exclusives, and have the best console ever made. If they reveal that by a 5 minute presentation where they say, "We don't really understand the point of gaming so threw this machine together. No idea if you console gamers want it or not. Whatever. *shrug*," the product would be lost to the message. We had this with some of their original ideas like game sharing. They did such a crap job of communicating their vision that people misunderstood it and took a dislike to the console based on what they understood it to be. Which is perfectly natural and sane - people form opinions based on information. If you want the right opinion from them, you have to provide the right information.
All this gen so far, MS's message has been obtuse. From renaming conventional parts of a GPU and generating all sorts of noise when trying to talk about their architecture, to saying their platform does one thing at a show and then having a web FAQ that explains it as something quite different, to presenting a conventional timed exclusive as being a platform exclusive, and now this snowballing where a light-hearted, tongue in cheek 'exclusive exclusive' tweet has people up in arms once again. They need to get on top of it. If they remain as complacent as you are, with the view that the message really doesn't matter, they'll lose business.