You could say the same about system libraries/binaries every native app needs to run
Native apps can share libraries at run time. I'm no electron expert but I'm assuming electron apps only can share dependencies at build time at which point they would be copied into the executable so they really wouldn't be sharing.
That might still be better (I'm undecided, personally), but it's worth recognizing that heavy native app is still there, just shared with a lot of other JS apps.