From the 1 GB a typical Electron app uses, only about 300 MB are binaries which might be shared if they were a WebView.
So yes, using a WebView might decrease your memory usage by 30%, maybe 50% for small apps. Not a huge game changer, maybe it would make a 8 GB RAM laptop more usable.
You talk like that's not a big deal! What percentage of users do you think still spends a lot of time working on 8gb ram laptops? If it was more than 50% I wouldn't be surprised.
The lowest hanging fruit when it comes to societal good that you can do as a programmer is writing software that is also usable for people with less money for hardware. And a lot of us don't even bother
