If you're talking about an app that exist solely as Electron, then you might be right. But the primary benefit of Electron is that you can distribute your already existing webapp as a downloadable app, which reduces the amount of maintenance significantly.
Also, when it comes to UI diversity and customization, nothing beats HTML+CSS.

And as you mentioned, there's a looot of webdevs. Electron empowers those people to easily create applications. Which they did, they created many useful apps. An application that isn't perfect resource usage-wise is often much better than no application at all.

Think of Minecraft. Java is arguably the worst language to use for a chunk-based 3D game. But it's still better than no Minecraft at all.

Writing the same app in Javascript for a DOM browser is quicker and easier than writing it in a native GUI toolkit, as you don’t need to think about life cycles or memory management as much. Of course, nothing comes for free, so the cost is borne by the userbase needing more RAM and faster CPUs to get the same work done. Which is philosophically in the same tradition of offloading negative externalities as dumping toxic waste in rivers.

I think there's a bias in the US against this sort of thing that doesn't exist (or not to the same extent) in Europe due to the age of the cities/buildings.

In the US, a building from the 1700s is a historic artifact to be cherished, while in parts of Europe a building from the 1500s is just the local pub.

So, the US is often hesitant to modify these old buildings, but Europe seems to have more of a perspective of "it's a building, not a museum, let's give it new life by modifying it."

This is just from the perspective of me, from the US

and I think these old/new buildings are really neat!

Another similar building is the Bundeswehr Military History Museum in Dresden, Germany

https://en.m.wikipedia.org/wiki/Bundeswehr_Military_History_Museum

How do the floors in the upper structure handle the sloping incline of the geometric shape? Is there just a lot of closed off volumetric slivers between the planes of the floor and ceiling and shell, or is there only one or two floors, with the upper floor having a larger rising canopy?

I know, I wanted to try a ground up GTK one.