If that button does anything relevant, it's going to leave evidences on your server anyway. Theoretically, we don't really need JS to reload a subset of a page on a button click: HTML and CSS are enough, with proper uses of IFRAME.
However you are right that, if you are using JS anyway, a bit more bloat doesn't change much.
The point is that we shouldn't use JS just because it exists, but only if there's something we cannot really do otherwise. Forcing our users to execute code we didn't write and we don't feel responsible for is rude: we are wasting their resources (and potentially compromising their security) just to save some money.
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If that button does anything relevant, it's going to leave evidences on your server anyway. Theoretically, we don't really need JS to reload a subset of a page on a button click: HTML and CSS are enough, with proper uses of IFRAME.
However you are right that, if you are using JS anyway, a bit more bloat doesn't change much.
The point is that we shouldn't use JS just because it exists, but only if there's something we cannot really do otherwise. Forcing our users to execute code we didn't write and we don't feel responsible for is rude: we are wasting their resources (and potentially compromising their security) just to save some money.