I was actually going to add, that it really does seem to be more prevalent down south than up here in the bitter north. I suppose building standards really are different.
You have no idea!!!
When I moved here over 25 years ago, there were no building codes in the county! We found out the hard way, on our brand new house...
That was the one that I had so many problems with the pipes. The water waste pipe to the street was not big enough, laundry room sink and washing machine pipes were on NW wall, kitchen sink and refrigerator water pipe were on N wall, exterior foundation drains were ABOVE the basement floor, heat pump wasn't large enough for the first floor and basement, thermostat for heat/AC was on the wall of the warmest room in the house due to southern exposure and in front of a window, wires in the walls that went to nothing, and on and on and on. We spent almost 2/3's of the original price 5 yrs later trying to correct all the mistakes. We should have just moved, as it was impossible to recover costs and still have a comparative appreciation, even after 15 more years.
Even in the house I'm in now, that was built 4 years ago, I have 1 toilet on a S wall , and powder room sink and toilet are on W wall.
Both have heated rooms below though, so I guess they will be ok.