[lucasjake]

Product guy really boils down to Generalist vs Specialist. Maybe it is 'Versatilist.'

The product person can't be an expert in for example, cryptography, and simultaneously be an expert in photo filter technology, and also the 100 other things that the product needs.

The end product might need all these things, and need specialists on maybe 5-10 of the items. The product person needs to be able to understand how all of them work, and make an end product that has market potential.

A product person can build products on their own if they have to. They are just better and faster when they have a team. If you can't do it on your own, you're probably not a real product person.

[gujk]

Your paragraph 4 contradicts paragraph 2.

[viscanti]

Only if the only way to build something is by being an expert. It's possibly to "adequately" or "poorly" build something without being an expert.