Before you spec a single conveyor, before you size a motor, before you even think about a sorter, you have to know exactly what you're moving. Not approximately. Not generically. Exactly. The product decides everything downstream: how wide the belt is, how the rollers are spaced, how fast it can run, whether it can even be conveyed at all. So before you draw a line, you learn to think like the package, to feel what it feels going through the system you're designing. Then you turn what the customer handles into numbers you can build from, and you draw an honest line around what this system is actually for. Get the product right and the rest of the program is tools. Get it wrong and you'll spend the whole project retrofitting a design to a reality you never understood.