This is oversimplification. One reality is more like "You are handed a system with a heavy on-call load. Make it better." The other is "The system you built w

This is oversimplification. One reality is more like "You are handed a system with a heavy on-call load. Make it better." The other is "The system you built was great with 1e9 load, but now we're heading for 1e12 load. Make it better."