When you think of Bob Gibson or Randy Johnson, you think about the dominant fastball. Obviously, both of these pitchers had a lot more going on than just a fastball, but the root of their success was simply being able to overwhelm and sometimes intimidate opposing hitters.
However, dominant fastballs are not obsolete.
There are plenty of powerhouse pitchers in baseball right now, and here are the top 10. All velocity and standard statistics are coming from Fangraphs.