I think you are misunderstanding something. "Let it crash" doesn't mean crash on everything. It's about handling the _unexpected_. Someone posting bad data may

I think you are misunderstanding something. "Let it crash" doesn't mean crash on everything. It's about handling the _unexpected_. Someone posting bad data may or may not be expected. The primitives are such that you can _choose_ how much or how little supervision you want, for a given complexity or maturity of a project, or what you learned as users put the system through the wringer. This is a _choice_ you make as an engineer, and OTP makes it easier for you to make such a tradeoff. Other systems and framework do not necessarily let you make such a tradeoff as gracefully. This not only allows the software to scale gracefully with the number of users, this allows the software to evolve gracefully in complexity and maturity.