Sure, you always have to handle the case that an unexpected error occurs, but every unexpected error that occurs in production has a cost. What that cost is de

Sure, you always have to handle the case that an unexpected error occurs, but every unexpected error that occurs in production has a cost. What that cost is depends on what your software does and how your users are using it, but there's always a cost. You may decide in your particular context that there is no amount or severity of errors that is too costly for your users to encounter, but most successful software endeavours have some limits.