It has been suggested by the H5P community to use different icons for the different content types. This will make it easier for the user to know "what this activity is".
Imagine a course with only H5P activities – it will not be easy or quick to differentiate between them.
Implementing this is possible and actually quite simple through implementing the '_get_coursemodule_info()' hook in lib.php.
We should probably add a setting to override this and stick to the old behavior for those who want that.