people loves enterprise architecture jokes but all starts with some questions: what if I need to use the client datasource for the input numbers? what if a clie

people loves enterprise architecture jokes but all starts with some questions: what if I need to use the client datasource for the input numbers? what if a client ask to send the output to a network endpoint? to a printer? so you start decoupling things. this here is played for fun, but if you need to build something that lasts 10 years across a multitude of clients instead of just as an one off project those question starts to be legitimate.