I hardly think Apple left out the ability to share files via bluetooth because they thought it was "on the way out". If anything people are just discovering that such things are possible, and the bluetooth is useful for more than just audio.
...jailbreaking...
All that said, when the new iPhone 4 comes out, do you think you'll be able to just plug it in and upload new firmware to it? Or use your non-approved apps on it right away? No. Someone else has to do the work of breaking into it and providing that "trivial" way to break it. With the N900 you can do that right out of the box, as documented in the manual that comes with the device. I call that a key difference.
That's hardly the same thing, and you know it. Frankly, I was already subscribed to the OVI chat app, so no SMS was sent from my device. Did that SMS magically tell them that you'd broken the warranty on your device by installing a root kit? No. Could they send a signal out to deactivate your device because of that change, and legally get away with it based on their EULA? No. Apple could probably make the case for doing so with rooted iPhones though. And if they choose to, do you think you'll be able to reflash your device then? And re-activate it?
Call it that if you want, but by the letter, what I'm saying it true. If you jailbreak your iPhone, you're voiding the warranty and breaking the terms of the EULA you agreed to when you activated it. That's not the case with the N900. With one you're taking a risk, the other you are not.