And of course the Bally bingos have the infamous "reflex unit", which adds and removes features depending on how much you've won lately. The more you win, the less likely it is that the higher-paying features will be available. After you lose for awhile, the reflex unit moves back and allows more features to become available.
Most modern pins adjust the score needed for a replay up and down according to the results of the last game. They also change the number of target hits required to activate features during a game. It can be a very subtle difference, and many players might not notice. The number of hits it takes to light a feature can change up or down.
We've adapted to this over the years. You just have to PLAY BETTER!!!