I live in the old Lyon district and I agree entirely, but it's hard to buy into the argument that "we can't build this anymore because it'd too expensive", as if the people at the time were all incredibly rich. As far as I know people back then were much poorer than we are today, especially in the cities.

Now I'm not saying I understand why it was done this way -- it's honestly quite puzzling how we seem to have abandoned these myriads of techniques that made everything we built so beautiful.

My theory is that it was more likely a culture thing -- back then, you wouldn't conceive of an entrance door without some wood sculpture or at least some elegantly carved stairs. That just wasn't something any architect or artisan/builder would do.

Also in these times of "climate crisis" it's striking how old urban planning makes the temperature much more balanced and the air flows much more nicely. There's a 3°C difference between the town center and my old district, because mine has very few concrete (old paved ways), no cars and has stone walls. My friend in the city center has 27°C in her kitchen. I'm still at 20°C.