Extrusion vs Scaling?

Just wondering if anyone could explain the advantages or simple reasons for using extrusion over simply scaling a mesh.

Extrusion and scale different operations, scale pretty simple.
But for extrusion you can find more options for different purposes
https://docs.blender.org/manual/en/dev/modeling/meshes/editing/duplicating/extrude.html

With extrusion, you create new vertex

i extrude 1 face of the ico sphere (in a ico sphere 1 face = 3 vertex), Blender add 3 new vertex to the structure.

Thank you both!

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