Because they run as separate processes. I frequently just close all my browser windows, which would exit any browser based apps. Electron app are their own thing, and lives outside my browser window. Electron apps also have their own dock icon and exist independently when I tab through my open applications.

That's also why I strongly dislike PWAs, they DO NOT exist independently of my browser. They are very much tied to the browser (well Chrome), which seem illogical, given that they have their own icons/launch thingy and pretend to exist as their own process.

I get that Electron and browser based apps work more or less the same, but I interact with the two types applications in a very different way. That's what I care about, the interaction, the underlying technology is irrelevant.

Because you're likely editing local files with an Electron powered editor as opposed to files on some other server.