I wanted to follow up to explain the intent of the new feature. It was not, as many posts are focusing, meant as a way for newbies to easily post their waymark even if they didn't know the category exists. The intent was to create a way for people to post locations that don't have categories at all.
Right now you can either post a waymark in an existing category or hold on to that location until a category exists. Or if you are feeling particularly motivated, you can create your own category and find several officers to help. This new feature also allows you to post the waymark and hope that someone else will see a trend and create a new category for the waymark.
Time will tell whether this new feature will encourage new waymarks that have no category, but the hope is that we create messaging and tools to make this behavior happen. Granted, it will be used for waymarks that do have categories but my hope is that this will be the exception, not the rule.