Why would people play blind pick as their normal game mode?
Why take a chance every game that you're not going to get a role you want?
Why fight over who gets what role and have to deal with a Darius ADC because he couldn't get top?
I just don't see why anyone would want to do that as the norm. Draft is just better in every way.
The only time I ever go blind pick is if I want to try playing a certain champion but its being banned in half the games. Other than that, I can't imagine why you'd bother with the mode.
Maybe if you're a Yasuo main you have no choice. But then that raises another point: Why would anyone want to play a game mode filled with Yasuo mains?