if he adds these loops, then the character will look completely different.
not all character have the same edge flow,
it looks fine without all the edge loops imo.
edge loops makes it easy to animate and deform, thats all. if u are making a still or will not do heavy animations, the topology does not have to be a basic loop "cage" and your char will look great.
its just give the impression of sliding on a mucle or a skin being deformed, since they move in better arcs then straight lines.
but that does not mean its a bad thing to do it without edgeloops. its totally fine.