Within each of these talent trees are many, many choices. And while cookie cutter specs eventually develop, the option is still there to allow for whatever spec or combinations of specs you decide works best for you. The rest of the world be damned, it's your choice.
However there are some exceptions to this. These occur in talents that we all need to play, more or less. Or in more specific terms there are talents that the rest of the tree is designed around. One such talent is Titan's Grip, and according to Ghostcrawler Blizzard is okay with that (for now).
This paradigm present a deviation of sorts, where in previous iterations of talent trees Blizzard has made a point to stay away from any major defining talent. This is not necessarily a bad thing, in that these talents are useful and provide a great aspect to the game. However at the same time, if people are going to be forced to spec into them, either because they're so great or because every other talent essentially requires them, then why not just make the super-uber-awesome talent part of the root class abilities?
Instead of having Titan's Grip be something a Warrior has to spec into, why not just make it an ability that only works when spec'd deep into the fury tree?
I have a feeling this might be happening in the distant future, but for now everyone will be putting that mandatory point into the fury tree.
Article art from the WoW Trading Card Game, copyright Upper Deck.