Rotating through on call, especially having not just ops, but engineering rotate, is a huge benefit.
As much as DevOps is being promoted, there are still two fundamentally different skillsets and job descriptions, and if its just the Ops side of the house getting the 2am wake-up pages, you're going to get a decidedly different attitude toward Things Wot Breaks Prod than if the developers are on that rotation as well.
Plus it means rotation comes up that much less often, which is a good thing.
As much as DevOps is being promoted, there are still two fundamentally different skillsets and job descriptions, and if its just the Ops side of the house getting the 2am wake-up pages, you're going to get a decidedly different attitude toward Things Wot Breaks Prod than if the developers are on that rotation as well.
Plus it means rotation comes up that much less often, which is a good thing.