Value of projects

I understand the use of projects like “Galls of North America,” which holds a diversity of taxonomically unrelated organisms, which all make galls. Adding a gall observation to the project helps gall experts find it and identify it. There is no other way of categorizing something as a gall in the rest of the iNaturalist interface that I know of. But what’s the value of a “Birds of Texas” project for example? You can already find all the bird observations from Texas without the project.