You are taking that in a different context. It should be read as software development is easy compared to marketing that software. For example, in a child comm

You are taking that in a different context. It should be read as software development is easy compared to marketing that software. For example, in a child comment you mention go build photoshop and get back on how "easy" it is. Problem is more complicated the software, harder the marketing part. In-fact, you might need a full fledged marketing and sales team if you were to successfully launch a complicated software.