Automatic Vertex Group assignment on creation

To create assigned Vertex Groups faster, it would be nice to have a Pop-up dialog asking “assign currently selected Vertices” when creating a new Vertex Group in edit mode. Alternatively there could be a switch setting for this task.
(not implemented in version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f54494e)

Can you try again with Blender 2.81? This works fine for me, I get a pop-up dialogue just fine here when using Ctrl + G.

Your solution with Ctrl + G works just fine. I added a Vertex Group using the “+” sign in the Object Properties Panel. Appears that the method I used before just creates a Vertex Group data object as a placeholder.