That really makes no sense to me. When I go to a restaurant, I value the food a lot more than the service. I've come back again to restaurants where I hated the service but loved the food. I've never returned to a restaurant where I loved the service but the food was so-so. So, if I had to choose, I'd be tipping the kitchen staff only.
But as a European, I don't really like the practice of tipping and the rather pushy service from waiters trying to increase the bill (and come every 5 minutes asking me if everything's alright) that comes with it. It's also so much easier to not have to think about tipping at the end of a meal.