Then someone will come up with ElectronOS.
Unfortunately some people seem to have missed that this talk was labeled "comedy" and "absurdist", are actually trying to implement a JavaScript kernel. The talk just got the name wrong - it was "Electron", not "Metal".
I know it's an experimental project, but that's exactly the time to learn Ruby+Tk, or {anything}+Qt, or any of the other cross-platform toolkits. If you have to bundle an entire GUI server ("the browser") with your app to shoehorn HTML into use cases it wasn't designed for, you're doing it wrong.
"wrong" is subjective here. You could also argue that Ruby+Tk is "wrong" because Ruby is not as efficient as coding in C++, or C, or Assembly.
What we're talking about here, (and every time this comes up, again, and again, and again, over and over) is what shortcuts you're willing to take to get to MVP. There are a lot of Electron success stories out there, and when you're a solo dev starting out, and want to make a cross platform app, Electron is approachable and proven.
Question is how much memory would actually be saved.