To add to this: larger houses and plots hav the knock on effect of making under street piping need to be x3 or even x4 times longer to span the frontage, and have more complex outputs, and be larger with higher pressures - same but inverse for waste lines and their inputs.

Same for electric lines, and those lines have to carry _way_ more power. And Internet cabling, and road surface standards are higher, blah blah forever.

Size and modernity makes this not scale so linearly

The debt of modern development is higher than the debt of the previous cycles.