Sometimes bloaty design decisions transcend the question of programming language. Electron probably has (I didn't check) a faster JavaScript engine than Qt, but I'd expect that similarly sophisticated implementations of the same program in Qt or Electron show an advantage in performance to the former. But people use Electron because it's familiar and it's got a lot of active development, and more cynically, Google likes it that way because it means that people keep coding for Chrome (cf. Microsoft's VS ecosystem, Apple's walled garden, etc).

The problem with modern software is that vendors encourage new developers to learn using heavyweight toolkits because lock-in is profitable in the long run. One day Electron will work with Go, but it will still be a plague.