@leocg Sorry, I really can't accept that. In the thread you referred me to above, on the same topic, two years ago the Opera representative @kmielczarczyk says:
"We should do better. We're looking into this issue and are determined to fix this."
The pinboards header still shows "beta" (if you know where to look and use a magnifying glass).
As for using sync, to quote my original post:
"I disabled sync after attempts to sync my Android phone to the PC resulted in many hundreds of bookmarks on the PC being wiped and replaced by the few older ones on the phone."
Now I can't even get sync to work at all, and as often as not can't even access my Opera account because it throws a tantrum ("Sorry, an error occurred") when I enter my email address correctly. After scanning the QR code (having backed up bookmrks) there is no field to enter the numeric code from the phone and I get another unhelpful error message.
All this would be brilliant if it worked properly, but why does it have to be so difficult? Especially for those of us who struggle with all this confusing stuff?