Really? IME most devs are incredibly bad to underestimate the complexity of apps and problem domains where they don't have any experience. I'd say an app like

Really? IME most devs are incredibly bad to underestimate the complexity of apps and problem domains where they don't have any experience. I'd say an app like Reddit is especially prone to this because most decent devs probably could recreate the core UX (subreddits, posts, comments) in a couple of weeks. The really hard part is all the features people don't usually think about (mod and admin tools, for example) plus scaling up to millions of concurrent users.