Much as I understand the sentiment, we know these are shorter-than-ideal-five car trains, whose length is limited by the infrastructure, and that there’s already severe over crowding on the route. Hence buffets that are already a waste of space on the current fleet can’t really be justified, and neither could a full size galley that, just like on the Meridians, wouldn’t be used to cook meals anymore (or only on a few trains), but would take up half a carriage of seating space - just as with the farcical kitchens on the GWR fleet.
The “demand” as passenger numbers continue to rise over the next few decades, is going to more focussed around getting a seat, or even getting onto the train at all, than getting a cooked breakfast etc.