Why preflop charts are important even if you're experienced player?
You may think that poker charts are for beginners only. But it's not true. Even professional players use preflop charts to keep their ranges in mind while playing. Of course, we need to exploit our opponents and deviate from the standard strategy from time to time. But it should also be the base that we will deviate from. Otherwise, our ranges may become completely random. And it'll be difficult to estimate our equity and quality of our decisions.