>Does it even matter if your model is made of quads?
Yes. There are many reasons for why we build quaded surfaces with clean loops and edgeflow.

>What even is an "isoline"?
isoline display is a term for how 3D editors hide the non-edge triangles of polygons from the author of surfaces to enhance how the mesh is read and organzied by the human operator.

>The model I've shown is still made of triangles.

All polygon meshes in software like maya, max blender etc are always composed of triangles.
pairing two triangles together is what creates a quad. The author of your model built it using quads.
When you rip a model from a game engine or expeort it it to engines in certain file formats information on what edges are isoline is discarded as
it's now junk data since the file is only supposed to be machine read from now on.

You had access to the original file of the artist you'd be looking at a quaded model.
pic related highlights what's going on there.

You look at how the surface is organized you can reconstruct what the quadflow would've looked like during construction.

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Anyone else feeling like animation is a massive AUTISM thing?