In 7.2 when you viewed the Vocabularies in Control Panel -> Categories, the UI provided the Name and Description of the Vocabulary, plus it listed any Asset Types that the Vocabulary had been Associated with, and it indicated whether this was Required or not.
In 7.3, the UI has been changed so that the list of Vocabularies is always displayed on the left, with the Categories for the selected Vocabulary on the right. In making this change the information about Associated/Required Asset Types is no longer visible in one location - but requires three clicks to be displayed (Select the Vocabulary, Select the Kebab menu, choose Edit).
Further to this, it is no longer possible at all at a glance to see all of the vocabularies that are Associated with an individual Asset Type.
A suggestion would be for the initial display of Vocabularies to show the Associated/Required Asset Types, and then for the UI to change to the current view when the user selects a specific Vocabulary.