It is not necessary to draw a sharp line that clearly divides everything before saying “this is too far” about something that has, in fact, gone too far.

At what point of detail/complexity does my restaurant order transform me into the cook?

Good question. Maybe not cook, but consider someone who picked just the right ingredients and preparation for a sandwich. Combining flavors and textures in novel ways that are as surprising as they are delicious. I would ascribe more of the creative credit to that person vs. the one cutting the bread.

So you are taking the ridiculousness of calling someone a 'sandwich artisen' (slapping together assembly line type products is slapping together assembly line type products) but trying to spin it into a positive label?

Yes.

Does the guy who tells the composer "write a song" create?

No.

The line is somewhere in the middle