Not necessarily. If there is a flaw in the design or ruleset of the game and one player knows how to take advantage of that, they can have a severe advantage over other players. There are many games where knowledge of the rules and knowing where the scoring is improperly balanced can be exploited by even average players.

For example, many Bally/Williams game video modes are not random, so if someone knows the pattern, it's not challenging at all to do well and get extra balls and other awards.

As others have said, some games are "one trick ponies" in tournament play. The way to score big points is to play a very specific way, often avoiding a majority of the game's features and ruleset (i.e. Fish Tales, where you can shoot the boat ramps over and over scoring more points more easily than getting multi-ball)