Hahaha You say it doesn't make sense as I have one right here in my dining room. Sometimes it doesn't make sense from an architectural layout, but it could be loadbearing and/or appliances are running through there (pipes, electrical, gas). And lots of places were built in the 60's so they've been heavily modified since original construction. I'd laugh if you were saying it isn't realistic and the author just drew his actual house hahaha.