Curious from a theoretical standpoint - isn't one of the downsides of Electron that it's standalone and not really designed to be shared between different instances of the same thing?

For instance, Slack is a famous Electron app as well as Zoom. If there were a framework where they could share common resources couldn't it be as theoretically efficient as having separate tabs in Chrome? I know we are well beyond something being possible in practice that does something like this, but it feels like it could be theoretically possible to use way less resources doing something like this.