Their UI feels alien on every platform. The startup time, memory consumption and general performance is subpar to native applications. Generally, I feel like developers who make software for platforms individually care more for user experience. Like this app, for example, it feels polished, uses the native OS X UI elements and performs super fast (much due to Swift in its nature being faster than JavaScript).

I certainly see the point and some use cases for Electron, however I dislike the recent trend of reinventing the wheel of every application using Electron.