The artists are adding assets to the game as they finish them. If the artist decided to fix the buttons (if they AREN'T his own little joke after all) then it won't hold up A21 at all. Any art assets that are done in time will be added and any that aren't done in time will be added later. There are changes that do impact other systems but since the buttons don't actually work and are just for show there is no impact or delay at all. The vending machine got a face lift but it still works the same as it always has. It is a container with a menu that will let you spend dukes to get items inside that have no dynamic connection to what is seen through the glass as you walk up to it. You won't be inserting dukes and pushing buttons and watching your item spiral out to fall into the slot below.