First of I hate the addition of subcategories it made things more complex and less efficient.
Second there is a major bug about subcategories: when you select a sub-category it is not saved and automatically changes to main category!! for example if you pick “adventure” subcategory and then save it will change to “Outdoor and adventure”
Another thing that bothers me is that the subcategories are not visible in the search left panel, and thus these sub-categories are useless because users do not have access to them while searching.
I suggest removing these subcategories!