Think about interviews. You’re in a system design round, and you propose a simple solution. A single database, a straightforward API, maybe a caching layer. The interviewer is like: “What about scalability? What if you have ten million users?” So you add services. You add queues. You add sharding. You draw more boxes on the whiteboard. The interviewer finally seems satisfied now.
At one extreme: if you’re making a prototype or quick script, I reckon all errors are unexpected. You might decide not to handle problems with the network, filesystem, or user input. Who cares? This is just a little script or idea.
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