I have never lived in a modern house - which itself is so cheaply made friends that work in construction call them timberboxes waiting to go.
But it's not the shoddy construction why.
It's the dull design. There's no character, nothing that makes old homes unique. The 'design' of modern homes is four walls, floor & room... sort of like a prison cell. And built like a prison cell because everything is cut flat, square and without actual design to wood, etc.