Electron apps is essentially running web apps wrapped as a desktop version. Most of them run like garbage and are always inferior to one made specifically for desktops. The only one I’ve used that runs sensibly is Discord.
As for why people use it, it’s convenient for developers as most of them are familiar with web development and can essentially copy-paste their web application without having to change much.
It’ll never replace reddit, but the hope is that it’d have a big enough community that it would be a viable alternative.