It sounds like what you had was continuous shufflers (CSM), where every hand or two has the cards recycled.
There's no real effect on the house advantage. It's kind of like dealing with a freshly-shuffled deck, every hand. However, the speed of play is usually quicker, so you probably lose faster.
Biggest bummers of CSMs is that you can't count counts against them.
Contrast with an automatic shuffler (ASM), where the game is dealt out of the usual 6 or 8 decks shoe, but there is also a device that shuffles the next shoe while you're playing the first one through. These also speed up the pace of the game substantially.
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