It does seem confusing. This is referring to changes which are now in beta. These do seem to be big changes, meant to be a different way of working with your en

It does seem confusing. This is referring to changes which are now in beta. These do seem to be big changes, meant to be a different way of working with your entire repo. AFAIK, projects has always been a sort of bolted on project management app. These newest changes in beta seem to be a quicker way to manage a high load of activity on a repo. The text in my GH present the product as "Built like a spreadsheet, project tables give you a live canvas to filter, sort, and group issues and pull requests." The spreadsheet idea is the key I think. Imagine that a spreadsheet like interface would be easier to managing a high volume of activity, rather than a click to form view.