this is sort of what I described here: https://forum.inaturalist.org/t/notifications-on-inaturalist-please-share-your-ideas/374/37. i think it makes sense to be able to collect observations in something other than a project. for example, a lot of people (mis)use the favorite button to mark observations that they want to come back to later. you could create a project to hold such observations, but i think it makes more sense to have a different mechanism (like a folder or whatever you want to call it) for things like that.
here’s a related feature suggestion wherein someone suggests using (personal) tags as a means to categorize observations: https://forum.inaturalist.org/t/add-search-feature-in-favorites/2502.