Albeit there are most likely a lot of "hackery" needed due to using Electron/web tech to get the optimal performance, this article is about architecture and how they originally did not build an architecture to support this and how they now needed to re-think that in order to get the startup performance they now desire - a situation you probably (likely?) could end up in using other technologies than Electron/web.
The high velocity web tech landscape and a startup (velocity) mentality are more likely the reasons why this was not made originally (most likely a good trade off, in particular the startup velocity argument). I'm a little surprised a community like HN don't see this, and rather bash Electron being the devil of all things (as some comments seem to imply). We should rather commend Slack for (obviously) making a decent tech choice (using a perspective where what really matters to them; rapid growth, is/was the first priority above all else, including "technical excellence").
The high velocity web tech landscape and a startup (velocity) mentality are more likely the reasons why this was not made originally (most likely a good trade off, in particular the startup velocity argument). I'm a little surprised a community like HN don't see this, and rather bash Electron being the devil of all things (as some comments seem to imply). We should rather commend Slack for (obviously) making a decent tech choice (using a perspective where what really matters to them; rapid growth, is/was the first priority above all else, including "technical excellence").