Let me add one more.
- Removal of the 32bit packages of chromium-based opera.
Since opera has dropped support for 32bit 2+years ago, please remove the 32bit packages from both the deb and the rpm repo.
Assuming that someone is advanced enough to first install opera's repo and then the browser from it, he can install opera's 32 bit version because the packages are still there! And this leads to more issues, like the one described here
For me, the vivaldi devs have done a more fundamental mistake than the csd: they made an electron based app. As far as I am concerned, it is my choise to not use any electron-based bs.
Also, the screenshots on the other thread you mention do not have any sort of csd, just a hidden title bar and they were made 8 YEARS ago, back when opera was presto based and could allow almost any change to its ui.