A spec and messaging aren’t instructions that are set in stone. They flex and change, shifting as new ideas are introduced, or new realities slap you in the face. Building a product isn’t like assembling an IKEA chair. You can’t just hand people instructions and walk away. Building a product is like making a song. The band is composed of marketing, sales, engineering, support, manufacturing, PR, legal. And the product manager is the producer—making sure everyone knows the melody, that nobody is out of tune and everyone is doing their part. They’re the only person who can see and hear how all
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