Service in Japan and South Korea is better than in American restaurants and you don’t have to bribe the staff to be nice to you. The price on the menu is usually cheaper too.
Also, pooled tips are basically a slush fund for wages since the entire point of tipping is supposed to be to reward good service and if the tip isn’t going directly to the person who provides the service, what’s the point? Ditto for any tip on a service that hasn’t even been performed yet, such as delivery services.