Eating at Lean-To's

Thanks for this forum, I'm learning a lot.

One of the recommendations (rules?) is to prepare and eat your dinner away from your sleeping area to reduce the chances of meeting a bear.

But tons of trip reports talk about stopping for lunch at a lean-to. Is it because the odors will have dissipated by nightfall? Or is it because lunch is often consumed but not prepared producing less odor? Or do people simply care less about someone else's sleeping area?

Or is it frowned upon to prepare/eat breakfast or lunch in/at a lean-to?

In practice, how many people (newbies or experienced) end up preparing/eating dinner at their lean-to? Does it depend on whether or not they are camping in the Eastern High Peaks?

Thanks,
AP