I can't speak to mobile, I really don't know much about mobile development.

But when it comes to the desktop, what's the motivation for a PWA over something like Electron?

I appreciate the app size would be much smaller, but then you're back to fighting browser and platform compatibility issues (such as those browsers that have weak support for PWAs). Seems that inevitably you'll be doing "Yes, its a PWA, but it only works/only been tested on Chrome". Well, may as well go full Electron and lock that choice in, right?

Or am I overblowing it?