Not only Electron apps, also any desktop program made with web technologies.
At an example, let's look at Dropbox desktop programs. In Windows is made mixing Qt, Python scripts, and native solutions (just have a look at the installation folder), resulting in both a worse performance an a use of RAM.
That's totally true. I forgot to write that Dropbox uses Qt WebEngine in combination with HTML + CSS + JS to achieve what could be done with just plain Qt with nothing more.
At an example, let's look at Dropbox desktop programs. In Windows is made mixing Qt, Python scripts, and native solutions (just have a look at the installation folder), resulting in both a worse performance an a use of RAM.