And then your customer changes their mind. Instead of two numbers, they will now input three numbers. How easy will it be for you to change your code?
And then the customer changes their mind. Instead of three numbers, they will now input any series of numbers. How easy will it be for you to change your code? And why didn't you already do this is the previous step?
And then the customer changes their mind. Instead of any set of numbers, they will now input numbers and text. How easy will it be to change your code?
And then the customer changes their mind. They now have no idea of what they're sending you or if they're even sending you anything.
Nevermind the code now, you already did that in the previous step, right?
How easy will it be to explain what you're invoicing them for?
If only you'd done the most bloated and well documented function first, you could have saved yourself the time and your client for the money.
I mean this is the kind of shit my boss would argue about. Why pay for the first attempts that didn't work.. blabla bla. He always ends up paying but it's always such a hassle.