There is a difference between "for breakfast every now and then" and "all day every day". I have a feeling that those who would be putting themselves under the risk of using glucose monitors tend to fall more into the latter group.

I would guess 90% of people who's eat ice cream for breakfast would be the type to consistently make bad health choices.

what you're saying is just that maybe it's not fine now as it was not fine then (as usual, this depends on the particular person).