Considering Slack and Discord also use Electron, and not only have much more functionality but also do it pretty much flawlessly (to reasonable extents), I don't buy this argument.
Yeah it's fine to call Electron a little memory piggy, but there's no reason stable apps can't be built on it. A company like MS should be embarrassed that their app sucks so badly.
Electron works wonderfully and is quite fun to develop with. It's a shame that the performance is.. questionable.. but it's not hard to make stable apps with it. Seems to be a Microsoft issue at this point lol