Professionalism. This could be described as “generally accepted expectations”.
You can get away with a lot if you are on the front foot of communication. Managing expectations. Anything less and you are at risk of being "unprofessional".
The deadline missed, the stock not delivered, the feature that does not work. All can be avoided, or at least softened, with proactive communication and a new plan.
Don't leave this up to your customers to figure out on their own.
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What would you do with and extra hour per day?