I think the right tack, if you're going to dismiss something as needlessly complex, is to call out the circumstances that would make it necessary and then describe what you'd do under those conditions.

"Backpressure? I don't think you'll have enough traffic to make backpressure necessary. The mode of failure here is that you run out of queue space and start dropping messages, and it's not a big deal if some messages get dropped here. But if we do decide that dropped messages are causing problems, and if it starts becoming a regular occurrence (we'll set up observability), here's how the producer can poll the queue size and return an error to the user under heavy load.