That implies that you have a fixed time for lunch and also chat during lunch. I may be the minority but I prefer to eat when I'm hungry and focus on the food instead of chatting. And there is also allergies, as a celiac, I have big troubles eating together with others - they may accidently contaminate my food

I’m actually curious here, not trying to question your experience but does other people’s food regularly contaminate your food when you eat at the same table as them?

I’ve lived with a celiac sufferer before and I’ve never heard of something that extreme, but everyone’s different.

When I've seen this done, yeah you block a fixed time for a "meeting", durring lunch time.