why they can't understand?

I don't understand the obsession with people wanting web pages to do everything all in the one go. It's like we're removing the need for hyperlinks and navigation. People are perfectly happy to edit the information in a new window, make their change, click the save button (which can close the opened window or takes them back to the originating page) and see their changes. The user knows what's going on as it's an obvious transition between Edit and View modes of the website. This is still a viable solution to a development problem and continues to be used today in mainstream applications like Yahoo!