Counterpoint to what? Slack runs on PHP. I'm sure it has hosted innumerable discussions by typescript or ruby fanatics linking the fractal-of-bad-design article and patting themselves on the back while clicking the fuck out of that :fire: emoji in response.
How is it a counterpoint? I don't know what technology(ies) Slack uses (except maybe the desktop client, which is obviously Electron) and I don't care.