Many users are annoyed of passwords - probably because they have grown with Windows - which began as a single-user non-networked system - even printers was physically connected to the computer.
That means there was no need for passwords - you needed the physical computer to use it.
Unix based systems however, has always been networked, multi-user system - hence there has always been a need for a permission based system with users and groups.
That is why you are required to use a password - even if empty - read the following but be sure you understand the implications.