Good eye! You are correct! We did not rough in the plumbing. The outlet in the wall is about 21" above the floor, a height I use for bathroom lavs. Kitchen sinks I usually set about 15" above the floor. Because it is so high, the sink waste and trap are too low, so we had to install the trap backwards. The only other option is to cut the back of the cabinet and wall out, cut the tee out and lower it. That is much more work that most people do not want to do. There will be water sitting in that center waste outlet. As far as problems down the road, if there is a lot of food particles and grease and stuff that goes down, it will probably have issues, but in how long, it is hard to say.