Does that really apply when the javascript is only ~2kb?
That is what's happening any time you've seen a website that randomly decides to load without styles, or with a missing image.
The good thing is that it's very apparent when that happens and you can just reload the page.
But it's not immediately obvious when it happens with a JS file.
That's half the reason why you shouldn't re-implement css features in a js file. (the other half is performance)
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> the javascript is only ~2kb?
It can be even 200Mb if it's not loaded properly and now a website doesn't even function.
Does that really apply when the javascript is only ~2kb?