Well, @anonan has been banned a few days ago, apparently. He's been making a lot of useful topics on the actual problems of the current versions of Opera starting from 60 and onwards. Mentioned lots of little and noticeable user-unfriendly details about newer version of Opera. Unfortunately, he wasn't very polite in regards to mentioning the competence of Opera staff lately, so this ban was only a matter of time.
I'm starting to think they aren't going to listen to us at all. I guess they're more concerned when someone finds a critical data or safety loophole, rather than caring about adjusting user experience while using the browser. I'll have to continue using the older version because all the new functions and defunctions aren't compelling enough to move on. This Side Bar thing is only one small part of the abundance of interface problems the newer versions bring to the table.