OK does anyone have any idea why conventional "breakfast" food seems to so often come with absolutely no vegetables?

Update on this: I feel like this problem has decreased by ~50% since (my memory of) pre-covid, more and more breakfasts have vegetables, especially in East Asia. Still far from ideal though.

I think intuitively (I am only referring to healthy eating) people eat breakfast that will sustain their productivity until midday. Veggies would not give you same satiety as healthy protein and fats. My idea of wholesome breakfast - eggs with tons of spinach and green peas plus an avo.