@Kyril0, I understand your point but after having read all the various comments to your thread I don't think that the majority of the Airbnb host do define their check-out time to 10 am or 11 am just because it might be the default check-out time in most hotels. Most of us have their own reasons.
In my case I started to rent out a private room in Munich some years ago and at the beginning I didn't have any check-in or check-out times. But then I learned that especially during Oktoberfest and international trade fairs I needed to define check-in as well as check-out times in order to manage back to backs. Of course I did offer to guests from the US or Canada (their flight arrives usually very early in the morning) to drop off their luggage and use the bath room and also to guest with a late flight to leave their luggage and pick it up later.
Now, I am living in a touristic area in the country side and this is a totally different business. I am getting guest from all over the world, but they they all usally have rented cars driving around Europe and so their arrival at my home does not depend on any flight, because they started in Berlin for 2 or 3 days, then they went to Prague, after this the came to my house (I am close to Salzburg), after this they went Venice and the to Croatia and finally they took ended up in Paris, Vienna or Barcelona to take their return flight back home.
In order to do the cleaning I need to have the guests check-out at 10 am, well between 11 and 12 is still ok, but then I am getting nervous to get everythig done before the new guest arrive, my check-in is from 5 to 9 pm. A lot of guest ask if they can check-in earlier which is no problem at the week-ends but due to my full time job this is not always possible (I hate the automatic self check-in, because I always give a little tour and ask if they need any tips for sights or restaureants or similar). Most of my guests check out before 9 am because they usually have to drive a couple of hours and want to arrive home before dinner. There might be 2 or 3 guests out of 200 who ask for a late check which is fine for me if the next guests arrival is scheduled late in the evening.
On the other side I do have quite often guests who ask for a late check-in after midnight (right after work they start driving 6 or 7 hours to get here), of course I accept, even if I have to get up early the next day to get to work . You see, I also do my best, but its not always easy to offer early or late check-in or check-out. Sometimes it is impossible and then I stick to my rules and all my guests so far did understand.
I personnally think your approach to offer a late check-out is an extraordinary conveniance from your side. Regarding an extra tool for a check-out depending on the flight scheldules I think this would be an overkilll.