I've got a quick question for the prescriptivists

Dear jheem, I wonder why anyone who is not a "prescriptivist" would want to consult a "prescriptivist" on the use of commas?

Anyone who wishes to make oneself clear to a reader will use commas judiciously, and they don't have to become slaves of "custom" to do so. In fact, they don't even have to be aware of such "customs" to do so.

Writers who are attentive to their audience display such attentiveness in everything they write, not just in the use of commas.

"Prescriptivists" generally are unaware of that. That's why they are generally pretty good at inserting commas in other people's sentences, but not much good at constructing their own sentences.