Thanks for the replies everyone! What was mentioned here is that hasten is not necessary to play the game, which is 100% true. That said, I still feel it is overall incredibly good for what it is and it's why so, so many builds have it. When building for performance, it's almost unheard of not to grab hasten which makes me think that the base recharge times of powers could benefit from a slight boost.
Hasten will still be great, but then it may also not be as sought after or polarizing.