It is. Tipping culture incentivizes American service to get you out the door and free up your table for the next group. The wait staff are also constantly coming by the table to refill things or ask you to spend more money on more drinks and food. If you don’t, the check is next. This behavior is seen as perfectly normal in the states, but I’d consider it much inferior to the German environment where you get to enjoy your food and your company and if you ever need anything, just motion the waiter over.