Your statement would be incorrect. You make the assumption that other people reviewing the code would be able to detect every bug. If all that's required is a code review to prevent software bugs, then surely a company the size of Microsoft would produce bug free software? They've got over 100,000 employees and have been working on some of the code bases for over 20 years, surely this means it'd be bug free according to your view? Quoting to simply highlight the significance. Again, any software written by humans is prone to error and bugs. This isn't a new concept. Updates and bugs in software should be planned for, anyone who doesn't treat software based platforms as an evolving system is in for a lot of hurt. Where are you getting the "at least 10 days" figure from?