"web app" covers a lot of surface though. Yes, if the web app in question is a static site that AI can shit out in 20 minutes, it doesn't need 10,000 engineers, but what about building, and running, and operating something like, say, Instagram. Which has a web app. End-to-end, all of it, down to racking servers in data centers across the world, 10,000 engineers sounds reasonable. So start by defining what this hypothetical webapp and how much kubernetes is involved.