Because why not?
Most of the wanted/upcoming features of 2D URP are not even listed in the main URP Product Board, and most (if not all) of the features in the main URP Product Board are for 3D only.
So…
Why not have a 2D URP Product Board so that way Unity users can see what’s currently being worked on and what will be coming up in URP’s 2D feature set?
It would increase the Unity-to-Unity-User transparency! (And I think we all would like that).
EDIT: Unity’s new roadmap website is now up and running and can be found here.