Yes, not terribly often but enough that the simple act of putting it in an airtight container is worth it.

Yes or more correctly, my wife and I used to until we started putting all such goods (flour, oats, rice) in sealed glass containers.

Perhaps you might not have been looking close enough. If you are not blasting through flour very quickly and you leave it in a bag, even clipped, you can get weevils and mites. This is not new. Ask elderly home cooks that you know. Putting it in sealed containers or jars, however, it can keep for a good while.

True. It's apparently one of the most common pests in Norwegian households and in the Scandinavian countries, but not that common elsewhere[1]. Seems it might be related to our climate, with cold winters but warm indoor temperatures.

[1]: https://www.pestium.no/skadedyr-i-naeringsmidler/hvor-kommer...