Not all casinos, and not even all tables within the same casino. Many of the Vegas casinos will have infinite shuffle machines on the lower-value tables ($5/10 per hand minimum) but have standard 6- or 8-shoe decks on the higher-value tables. The other trend lately is to make the rules less favorable on cheap tables (H17, no resplit, no DAS, etc.) and force you to go to a $25, $50, or even $100/hand table to get the player-favorable rules.