RE: Opera Mini 4.5 will not more be used?
Basically the "bookmarks" part of the new system is an afterthought.
Keep in mind that when they re-launched Opera, there was no bookmark system. We were instead supposed to use the quick launch system as a "bookmarks" system, this according to the hairbrained UI scheme some designer cooked up on iPad (Opera Coast or some such).
Then they realized this was unwieldy for anything but a small number of often used pages, and so added "folders". But even that proved limied, so they caved and added bookmarks back in, as a special entry on the quick launch page.
Face it people, the Opera company of today is not the same as the one that built the 12.x desktop, the original Mini and Mobile browsers. The current one is hung up on design for designs sake, and about chasing some internet "zeitgeist". What used to be a company run by engineer is no run by professional managers and cloudcuckoolander designers.