I mean, maybe we're missing context here. Is that what your boss was actually asking for? 99% of web applications (or, hell, desktop applications) don't have ultra-interactive, fully-responsive-animation drag-and-drop. If he was asking for functional drag-and-drop and the team was implementing top 1% cosmetic drag-and-drop, that's certainly one avenue for a mismatch in expectations.
I think people are talking about two different kinds of drag-and-drop. There is dragging external items (files from the OS, for example) onto the app surface from outside. And there is a list of items, each with its own UI component, being dragged within an app to either change sort order or otherwise change data state. Both complex, and have a lot in common, but many comments here seem to be talking about one or the other without specifying.