My feeling is you can't really compare domestic lounges in Japan with those in Korea because ticket prices are much more expensive in Japan. Inferior domestic lounges are the norm in many other places around the world. Thailand comes to my mind first, where TG only offers a poor selection of snacks and very limited drinks in their domestic lounges, many being ridiculously small, some not even being air conditioned. It's often more comfortable for me to wait outside. Wherever I go, I never expect to see a wonderful domestic lounge, of course I'd be pleasantly surprised if I happened to stumble across one.