Having worked doing building renovations I can honestly say it's rather frequent that you look at how the building is laid out and how the wiring/water/gas was run and say "what the heck was this person thinking?" - and that's not even including the times I've seen things completely impractical or wholly illegal.
In my present house we cannot have the central air turned on in the downstairs toilet if we want heating to the smallest bedroom (the 'infant' room) upstairs. Similarly the basement air vent was so distant from the conduits that the main level essentially has a heated floor (hot air can be felt escaping through almost every gap in the basement ceiling except the air vent it's supposed to come out of. Similarly the plumbing is so unbalanced that the shower can essentially be turned off by a good configuration of tap turns and toilet flushes.
Architecture is a joke, and the 'engineers' who design them should really consider building a house themselves, because I've seen every crazy design from doors being hinged to trap people in the corner of a hallway (literally you'd have to step into the far corner to squeeze around the door to exit the bedroom), to lighting layouts that didn't illuminate the room, or switches completely impracticably placed.
You're entirely right, people overlook 'bugs' in architecture, although in my experience it's largely because of ignorance of what it being right is. How do you compare a poor plumbing design in your house? Do you run through your best friend's place screwing around with his sinks and toilets while he's in the shower?
It's easy to compare two software programs to find a less buggy option, however it's hard to compare two houses to find a less buggy option.