Scrum came from a world where product folks and developers never directly talked to each other. Everything was a formal written request with some requirements and there were SLAs for how long developers could look at it before providing questions and estimates back. After one (two if you're lucky) round(s) of questions a deadline is established, and work begins.
In that world, creating a single product owner that had the full complete say of this is what will happen that met with developers on a daily basis is a huge improvement of individuals and interactions. This is the single biggest win of Scrum, getting people to just talk to each other regularly, by having mandatory meetings all the time. If an organization has good communication or a product is too large for a single person to manage, Scrum ceases to be as useful option.
In that world, creating a single product owner that had the full complete say of this is what will happen that met with developers on a daily basis is a huge improvement of individuals and interactions. This is the single biggest win of Scrum, getting people to just talk to each other regularly, by having mandatory meetings all the time. If an organization has good communication or a product is too large for a single person to manage, Scrum ceases to be as useful option.