It's not to often a guest inquiry surprises me like this one lol

That’s nice and all, but many guests don’t understand that “flexible” means “we need to coordinate a mutually agreed time”. Some see it as “whenever I damned well please and you can’t tell me otherwise”. And Airbnb doesn’t have a good track record of supporting hosts in that situation.

And then you get dinged in the ratings.

No, thanks - I’ll keep my “after 3pm” time and flex when I can.