These things are technologically obsolete imo. The same result can be achieved with glass coatings, without requiring the extra work to install/maintain or replace these appendages.

These awnings work against losing heat to the night sky, the same effect of which can be achieved with anti emissive coatings that reflect heat radiation back inside.

The awnings also work against the sun when it's high in the sky, for which there are now anti solar coatings which will reflect more light from certain angles.

Nostalgia is nice, but the modern solution is easier + cheaper to install and maintain.

A tldr image: https://www.agc-glass.eu/sites/default/files/styles/max_1300x1300/public/2024-05/diagram-coatings%20leaflet.JPG?itok=s97bN-aV

Longer promotional article: https://www.agc-glass.eu/en/sustainability/glass-sustainable-architecture/energy-saving-glass