Expats tend to move to more rural communities and with respect don't have a gauge of 'normal' French life or what the younger generations prefer when it comes to housing. Most people have to live/want to live in cities or the banlieue. whether that is Paris, Lyon, Bordeaux or wherever.
A common trend where we have our house is for people to buy a cheap old ugly 1950's-1960's pavillon houses and then get an architect to transform them. It is a better alternative to a new build because the invariably come with land. Most of the houses for sale are older houses largely because they are expensive and like I said earlier, difficult to live as a family.
Our 'short' street in the banlieue has a mix of social 'cube' type housing, some very large maison de maîtres, couple of longeres. In between all these houses where small parcels of land has become available two very large architect type houses which must of cost at least 1.5 million to build. You have to ask yourself why with that budget would they build there ?? One is retired. The house opposite us is a magnificent longere that is worth a fortune and guy cannot stop spending money on it. It has PVC windows. You can't tell.
Going back to the PVC debate...here is a typical beautiful square in Paris. Spot the windows made in wood. Look closely there are violet roulets there as well.
Also, next time the Elysee is on telly, check out their windows !!! They look PVC to me.