I’m very active and I still avoid them. It takes barely more effort to make some scrambled eggs and toast/eggos for the same calories as a bowl of sugary grain and tastes better too.
Making scrambled eggs isn't all that hard but surely you see that pouring some cereal and milk in a bowl is a fraction of the effort, even if the absolute difference isn't that huge?
The only time I would be concerned would be if I was pressed for time - in which case I’d be looking for something like a granola bar or protein shake over cereal.