Description of problem:
It is very confusing to use the graphic styles in Impress. When compared with those used in Writer, understand the logic operating in Impress is very different.
In Writer, styles names are clear and descriptive are unique or very delimited to an text object, while in Impress, most graphics are marked with the default style (eg text box, shape, connector, etc. ) or very different elements share the same style (eg, an image and a chart).

Improvement proposal:
Use descriptive names of the different elements that you can use in Impress to create styles. This would greatly improve the recognition of style options to the user, so it is easier to recognize that there is a way to "shape" and does not affect a text box or vice versa (currently selecting a text box and edit this style to add a border, does not affect the text box, but affect the new shapes inserted in the presentation).

Example:
Graphic style (or object drawing styles)
  + Lines and arrows
  + Curves
  + Connectors
  + Forms
  + Image
  + Table (can include table formats)
    - header
    - content
  + Chart (color series and general elements)
  + 3D Objects
  + Text Box
    - Header
    - Title
    - Subtitle
    - Body text
  + Etc.

Thanks