I often have the problem when there are a lot of modules on a page to identify the module type or moduleid, especially when the module title is empty. Thinking about a solution for this, the empty module dragbar comes to my mind and I made a draft of what I want to achieve:
Hovering over the info icon should show a popup with information about the module instance.
There could be more info, for e.g. like this community voice idea: Visual indicator when a module is shared or the module title (helpful if container with no title) or how the container is applied: for this module, by the page default, site default, or host default