Davinci is a nose based software as well (for the color part). The advantage is of course that you can easily copy graphs, parts of graphs or nodes from one picture to another. In a professional setting that means you can create one calibration node for your camera, one node to adjust differences between different pictures, one to use a certain look etc. You can combine masks from multiple nodes, do parallel color correction etc.
One of the examples show a merge operation though, which involves a sequence and therefore would not be possible with just a stack of layers.
Practically nodes make it easier to deal with more complex operations than layers (e.g. operations wherebyou have multiple source images and/or multiple target images, like e.g. in compositing, CGI etc)
And, lastly, node-based systems can be incredibly fun, if done right.
In the media industry, 2D and 3D roles employ very different skill sets, so while Blender could evolve to offer a robust package for compositors, this likely won't be their primary focus.