And your second point about obvious is flawed. Everything is obvious when you know the correct answer. For instance, a wheel is so obvious that a very young child could rationalize its creation and use. Because it's obvious once seen. But if it's so obvious, why did it take us 245,000 year or so to invent the wheel? Microsoft has been touting the tablet for ten years. Why didn't they create it, if it's so obvious.
I think all patents need to go away, I think they cripple innovation and make it impossible to create something new if you're not a giant corporation. But in so long as we're stuck with these laws, then every company has to try to patent everything it can so it doesn't get sued.