If you take an object with multiple faces, go into edit mode and extrude. You can’t scale properly.
What I want to do is select multiple faces and have them scale when you hit s instead of having them scale towards a common point for all the selected faves.
I want them all to scale on their own face. (So all the extruded object scale down, instead of warping towards a median point)
Set the pivot point to Individual origins.
Choose Mesh->Extrude individual.
Escape from the extrusion.
Scaling with ‘S’ now scales each face on its own centre.
Set pivot point to ‘Individual Origins’. You must be in face select mode, & you might get weird results if the faces are attached (you could try Alt+E -> ‘Individual Faces’ to extrude separate faces)