> The owner wants the maximum ratio of servers to customers possible. In the typical USA system, being paid primarily in tips means the server is highly incentivized to upsell the customer as much as possible and do everything they can to increase the total bill, and therefor increase their tip.

I don't think so. The biggest upsell of a US-style tipping culture is that restaurant owners have a no-downside free pass in exploiting workers. They are literally allowed to have people working for them for barely any pay and performing a role aimed at increasing throughput and demand. Therefore there is no incentive whatsoever for a restaurant owner to stop exploiting their staff.