Electron apps' Chrome stores its cookies separately from the user's installation of it, correct? That, plus the lack of a logged-in account within Electron's Chrome might help to mitigate user cookie correlation and the like, right?
But Electron app has full access to your system unlike normal web page. So it makes sense to run Electron apps from separate user account so that they cannot read your browser history, cookies, install you an extension etc.
I wish someone with a lot more knowledge than me on this replies. You raise a very valid, practical and useful question, would love to hear the answer :-)
If we're saying fire up Chrome just to watch Netflix, I'm suggesting saving some effort and/or isolate the rest of your browser by wrapping it in a very basic Electron app.
At the very least, you wouldn't get auto-logged into your "browser" or anything like that.
And honestly, when I watch Netflix, it's usually in my Surface, in which case I'll use the app.