Which leads to funny questions at development time like "how many characters do we reserve in the customer record for the third child of the second wife of customer X, when they're remarried, this third child is not a child of the customer but there does exist an alimentation 'agreement' between the customer and their third wife". You must make this decision knowing that whatever your answer ... it can never be changed again.
>500kb per record. And, of course, mostly it just has first and last name, address, birthdate and balance, nothing else.
Makes the web look efficient.