I don’t know if this falls into what you’re looking for but it is a community where people discuss changes to blender’s UI and features people would like to see. You can see people’s mockups and vote on the ones you like. The development team use this to see what people in the community want. For example the navigation gizmo was originally going to be across the top of the 3D viewport, but people suggested on the side and the vote led to it being down the right side.
https://blender.community/c/rightclickselect/?sorting=hot
