I’ve done some of that (and a few monocots) for stuff in bloom or fruit so I could annotate phenology. The thought was to make it easier to sort for broadly ID’d plants with reproductive stages that are presumably easier to push to finer ID levels. As mentioned before, annotations don’t appear on Plantae or Tracheophyta, it has to be Angiospermae or monocot/dicot level to be able to add these or filter for annotations in the Identify window.