We all want more. More means the same whether you’re talking about portion size (more of it) or number of plates (more of them).
However, we have to distinguish between less and fewer in such situations: we want less food on fewer plates.
Here, “less” refers to a lower quantity of a mass (less of it), whereas “fewer” refers to a lower number of discrete items (fewer of them).
“Fortunately, we are going to need less inhibitor in the drilling mud — 100 ppm or less.”
“After the major budget cuts, we will simply have to drill fewer wells — 14 or fewer.”
BTW, in my humble opinion, less is not more; more is more.