The reason for Electron's popularity is because:
1. web developers are cheaper and easier to hire than people with desktop software development experience
2. Electron is cross platform
Point 2 is a compelling reason. But it's not like other cross platform toolkits haven't existed. They've just been left to languish because of point 1.
If companies only hire web developers then of course everyone is going to invest time into writing Electron apps and banging on about the benefits of web applications. It becomes a self-fulfilling prophesy.
I say this with experience having watched the tides turn, first hand, as a software developer.