The one thing that prevents professional bowlers from always striking is that lane over time you change, they bowl on tough oil patterns, and it’s hard to throw the same shot over and over again. Rolling a bowling ball down the lane over and over again will soak up oil and push oil down lane.
When this happens the lane will change and all bowlers need to move from their spots on the floor. They also must have the right bowling ball in hand as well. But sometimes, you can throw a great shot and it just won’t strike. This happens to everyone, someone throws a bad shot and it strikes and someone can throw a really good shot and it will not strike. Pro bowlers bowl a lot of games so overtime they will get tried.
Just sometimes the bowling ball hits the pocket and it does not strike. These are the reasons why pro bowlers do not always score a strike every time they bowl.