Guitar can be a futsy instrument once a person wishes to push it's boundaries. Fingerpicking is a natural fit for pushing the guitar's cabalilities without bankrupting a beginner's desire for learning, but there are difficulties particular to fingerpicking that naturally challenge the way a person had previously thought of guitar. What makes the guitar simple to learn is that there are a set number of chords that we can plug in and play as needed without worrying about what makes them sound good together. The tradition of acoustic guitar in pop music is one of easy to learn conventions, once a person gets the hang of it. Fingerpicking challenges those historical habits nicely. All of a sudden, the guitar is melodic instrument instead of one that is just supporting the rhythm.
Paul McCartney's Blackbird is a fantastic example of a melodic fingerpicking piece. To a music-nerd like me, there are three melodies: The bass line, the open G string that rings throughout, and the melody that is played mostly on the B string. Three melodies! If you like this song, you'd notice that there is an open, ringy, almost jangly texture to the guitar part. This is what it sounds like when these three melodies are connected. Each melody is unbroken and sing-able. When the melodies don't connect to each other, it's not quite as sing-able. It sounds spare and sparse, but not in the good way. It sounds like a bit more practice is needed! Connecting each melody is not something we guitarists are naturally adept at, but playing Blackbird puts us face-to-face with that limitation and gives us a chance to do something different.
Whereas the guitar is usually used merely to take up sonic space in a song, fingerpicking makes the guitarist completely aware that there is more to it than simply choosing a chord and keeping the strumming going. Guitar suddenly becomes an entire ensemble to manage. Managing it, in my opinion, is well-worth the effort.