You still can create photo websites with Photos.app, you just have to create a shared photo album and then set an option to make it available as a public website. This should be much easier to do, though; the iPhone app is much clearer in this respect.
My biggest outrage over devolving software is how they took away the option of having multiple windows open in iTunes. I used it all the time to manage playlists and now there really isn’t a good way to do it at all.
