With one texture, you have one pigment, one normal, and one finish. Even if
you have a complex pigment, the result will be merged and returned as one
pigment. Similar with normals and finishes, what ever they contain, will be
returned as one result - one object layer, so to say.

With multiple textures, you have multiple object layers. This is necessary
for the blurred reflection trick to work. It needs multiple normals on the
object.

Regards,
Hugo

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