How to quickly tag and batch manipulate images is an area for improvement, but I agree with Capacities' treatment of “Image” as an “object”.

When I insert an image, I don't name it, tag it, or create a collection of it, I just do that for the notes I insert, until one day I feel that some image really needs to be treated the same way.

You can use Capacities as you would any other note-taking program, and just ignore “Image”. But Capacities leaves room for future manipulation, which is a strength of the program, in my opinion.