the other thing is averaging over days says nothing about spikes in the rate - I imagine very few systems see more-or-less constant traffic over the course of an entire day
I worked on a SaaS CMS. A major consumer PC manufacturer was a customer and their "Welcome to your PC" app would pull their news feed from our system. People would turn on their PC and they'd pull a little JSON. 100s of Thousands of request per day, no big deal. The manufacturer decided that they wanted the updates to show up for everybody at the same time on the hour. Serving 100k req/s for a minute is a much different problem to solve.
Pretty common in industrial control. Your sensors take measurements at a constant rate all day everyday. Sometime a pretty high rate e.g. IEC 61850 is at 4 kHz.
