In some congested airports, flights keep circling before they can land if they have missed their slot due to a weather related delay. Flights can also be delayed due to headwinds and make up time in the air (especially on longer flights).
For shorter flights and smaller airports situation would be different. I think Germany to Bombay would be a long flight, perhaps longer than North American destinations to PVR.
Again, I think other hosts can have valid reasons for requesting this information even if you don’t see the need for that information because of your hosting situation.
@faheem : some people in Western countries have high expectations of privacy to the extent that they won’t provide you your covid test results but still expect you to provide a refund. I ran into this situation recently.