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There are ways to debug minified JS in production, sourcemaps being one of them.

In addition to the speed difference, there's a significant payload size difference: something like 1.5+MB for the dev build, vs 70kb for the production build, last time I checked.

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Sourcemaps have the drawback that you actually need to generate them first. Sometimes, getting all of the tooling together is teedious.

And about the size: if the JS file is cached properly, downloading 1.5mb once doesn't seem like a huge issue, especially for something like Slack where only desktops use the web client (most mobiles probably download the Slack app). I don't know if this was the case here though.

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