Yes, you need to be sure that you understand the growth pattern if you want to YOLO in RAM. If your product aims to be the next Instagram, this is clearly not the architecture.
But a lot of small businesses are genuinely small. They may not sign up new customers that often. When they do, the impact to the service is often very predictable ("Amy at customer X uses this every other day, she's very happy, it generates 100 requests / week"). If growth picks up, there would be signs well in advance of the toy service becoming an actual problem.
But a lot of small businesses are genuinely small. They may not sign up new customers that often. When they do, the impact to the service is often very predictable ("Amy at customer X uses this every other day, she's very happy, it generates 100 requests / week"). If growth picks up, there would be signs well in advance of the toy service becoming an actual problem.