Another name for ellipses (…) is “suspension point” and doesn’t have any true grammatical purposes, unlike a comma. A comma doesn’t necessarily indicate a pause and makes no sense to insert randomly… wherever you’d like the reader to pause.

My personal use for trailing ‘…’ is precisely to escape formal language and hint at something that is more complex or emotional than a simple pause.

For instance “Did you just…unplug and replug the machine?”