As it turns out, I don't really use Opera any more. I could not conform it to my work flow, and the Opera team were not at all interested in what I needed to do so, after the change to Blink.
I do still keep a copy of the old Opera 12.18 installed in order to use the mail client, and I keep an eye on development, but that's it. No other browser available could adjust to my needs, either, until I ran into Vivaldi. So that is my default. It's a young browser yet, but it came right out of the gate with things I had been bugging the Opera team to restore, in terms of conformability, ever since the Blink change, and could not make any headway.
The sale to the Chinese was the final nail in the coffin for Opera for me. The worst respecters of data privacy and intellectual property ever to grace the face of the planet cannot get my support, I'm afraid.
So to each his own, I suppose. Contrary to the experience of @sgunhouse , I do not find Vivaldi at all buggy. Plus, it is the only browser in the world I can shape to my needs. So not to be a real downer, but "why use Opera?" I don't. I wish they could have retained my loyalty, but they were not interested in it.