There's often an implied point in the "but you didn't", which is that it might be harder than you think.

I knew someone who was a big fan of Jackson Pollock. He's famous, and he's also a useful punching bag because his paint splatters just look random. It wasn't until I tried it myself that I realized that splattering paint in a way that looked to me like a Jackson Pollock painting was... not something I could easily do.

I still don't particularly care for Jackson Pollock's paintings, but that moment was a useful reminder to me that even for things like programming, we have a tendency to underestimate the subtlety required to produce "good enough" work product.