Deck penetration has an important value especially for card counters and knowing it gives players a significant advantage. If the counter knows which cards are left in the deck, they can change the amount of bets, eventually the game strategy.
The Higher Penetration, The Better the Conditions for Players
Many years ago there was only one-deck blackjack. Dealers could literally give away the entire package to the last card. Which is very good for the players. But unfortunately, these times are long gone.
Casino management knows well what playing with only one deck greatly benefits players, especially card counters. That's why they started to play with 6 or more decks. And even more, in today the dealer also insert a special card before the end of the deck. This card shows so called deck penetration.
Players would like to cut the card somewhere between 65 and 70% of the package at any game. It does not matter whether it is a single-deck or multi-deck version of blackjack. If this is not the case, the player will not get into some favourable situations, which can then result in a big advantage over the casino.
Do not Play a Game with a Low Penetration Value
I even visited one casino where the cut card was put into half the six packs. Let's say it flat. For a long time I did not survive this game because penetration was only 50%. If the penetration is that bad, do not hesitate to move to another table or change the casino.