They put a few arcade cabinets in the breakrooms at work. One of them in one of the breakrooms I constantly use has Street Fighter II: Champion Edition, Super Street Fighter II, and Super Street Fighter II Turbo in one cab. I enjoy watching the demos the programers programed into the game when I am on break. When it's set on Street Fighter II Champion Edition, one of the demos that is constantly played is Ryu vs Ryu. Both Ryus just spam the fuck out of Hadoukens the entire time.
So if you ever wonder why people who play as Ryu tend to do nothing but spam Hadoukens, it's because that's the way the game shows you how you are supposed to play as Ryu.