That depends on if you're getting JSON data from someone you don't quite trust. For internal uses, sure. If a process sends you bad JSON you go talk to the tea

That depends on if you're getting JSON data from someone you don't quite trust. For internal uses, sure. If a process sends you bad JSON you go talk to the team responsible. But if someone outside your organization is sending you data (product orders, say) you want something like this to ensure it's well-formed before you start evaluating business logic & validation against it.