A true statement, but keep in mind if you go to the bank only with premium hands, your game will be easily predictable and you will not be able to earn a large pot in the game with regulars. From time to time, however, you should change your playful style.This is the first place depends on the position.. but range for open is AA-TT, AKs, AKo,AQs.. for 3bet or 4bet AA,KK,QQ,AKs. But position is very important for the decision! And of course no calls, only raise or fold
Edit
This is very different in cash games lol
All of the above standard set of cards with what it is advisable to go to the game, in theory.But in practice, who is what you want.There is a good expression,in poker there are no rules.
You are right, the theory there differs from practice, everything depends on the position, the number of players and intuition