[dmitriid]

> It could be written once in C++ using Qt, Juce, or Fltk and be blazingly fast.

So, it was written once using Electron and is sufficiently fast.

> This has been done thousands of times over the last few decades. Where does this myth come from?

There are surprisingly few cross platform apps written using these technologies that are fast, functional and have any degree of visual polish.

[BubRoss]

Neither of these things are true and there is enormous evidence.

First, if it was fast enough, people wouldn't bring up its bloat and speed in every discussion of slack.

Second, there are hundreds if not thousands of programs much more complicated than slack that work exceptionally well and have been made with these GUI libraries. A minimal amount of searching would show this.