I mean, making simulations of what you're going to build is tremendously useful if you can get feedback from them that will tell you where you've gone wrong and what you can do about it.
“The lecturer should give the audience full reason to believe that all his powers have been exerted for their pleasure and instruction.”
“This is how it has been since time began: If you want to make something really worthwhile and true, then you have to suffer for it.”