Earlier quoted context omitted.
The simplest explanation for this is the fact that the desktop apps are native apps and not based on the massive and sluggish electron framework.
I don't think this necessarily has to hold true (Discord for instance have implemented their apps really well), but in reality this holds true for most electron apps in my experience.
Unfortunately, there aren't many native applications any more. At this point I'd prefer a Windows application that works in Wine over yet another "cross-platform" Electron webbrowser-with-builtin-website.