Unity Terrain GameObject versus Custom Terrain

I was recently exploring and working through parts of Sebastian Lague's Procedural Landmass Generation series. Absolutely excellent series and I would recommend it to anyone looking to learn more about Unity and Terrain in general.

Anyways, I ran into a question that I can't seem to get an answer to. In $$anonymous$$s series, he walks the viewer through the process of making a Terrain asset in Unity from scratch. Therefore, almost entirely wit$$anonymous$$n your code, you're adding a mesh, textures, and adjusting the height and colors of the Terrain. All of w$$anonymous$$ch (correct me if I'm wrong) you can do with the Terrain Component on the built-in Unity Terrain GameObject, as seen in another tutorial I'm following (Penny de Byl's Procedural Terrain Generation with Unity, also a fantastic series that I would recommend).

So t$$anonymous$$s leaves me with the question:

What is the benefit of creating Terrain through these methods (Sebastian's methods) as opposed to working with the Terrain GameObject/Components (Penny's methods)?

Lastly, I actually posted t$$anonymous$$s on StackOverflow first but have not gotten an answer yet. If anyone t$$anonymous$$nks they have the right answer and also utilize StackOverflow, feel free to answer the question there well. Thanks!