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Engineering is about tradeoffs -- are the resources invested in improving a system worth the return of said improvement? We know full well how to build bridges that will last a thousand years, we just choose not to because it's not an effective use of public funds compared to a fifty year bridge.

The same applies to software engineering -- each additional edge case you handle increases cost but has diminishing returns. At some point you have to say good enough and ship. The cost of perfection is infinite -- you have finite resources, and a great part of engineering is deciding how to allocate them.