I hope entering buildings should have been like, when you knock the door of Rosa in Fiore, Claudia opens the door for you. Right before you knock La Volpe Addormentala, La Volpe will quickly say “You’re most welcome! Come in Ezio.” Or when you knock the Barracks, Bartolomeo would scream from the room “Who goes there?” and opens a peephole, Ah Ezio! I was expecting my wife.” Instead of having the keys of every building in your pocket and entering the room without caution.
image from madeinmasyaf