I agree with the request to get the Speed Dial button back on the address bar. On the right side, it has Pinboards, Snapshot, Privacy Protection, Send to My Flow, Add to bookmarks, Downloads, ... . I would happily trade each and all of them for the Speed Dial button and of course it should open in the current tab. If I want a new tab, I will press the "+".
Opera, you make a wonderful browser, but removing the Speed Dial button (or replacing it with a "new tab" clone on a sidebar which either have to take space from my browsing or "auto appear" which drives me crazy) is a massive blunder. Please, fix this ASAP!