I always thought the selling point was the e-mail /rss / irc etc. The things Opera came bundled with. I am sure these will still be available via extensions but then again I don't see the point of Opera now. It is now the same as Chrome.
Each browser has its own selling point. I feel that Opera has lost its by stripping out email and providing no news on other features. I always interpreted these features as the differentiators, the soul of the Opera browser. Opera users were people who embraced these things. Opera used to ship with a built in bittorrent support.. how sweet was that!?
I moved away from Opera when I used IRC and bittorrent far less. I also realized I could test less if I built a site testing as I go in a popular browser rather than a fringe one.
I probably could have done everything I did in Opera using extentions in another browser but Opera just did it out of the box. Its features had consistency and were easy to access. The reason I would choose Opera is because of what it used to be packaged with.
In it's current form it is an alternative version of Chrome.. I guess I could develop in it and have Chrome covered but realistically it would be simpler to just use Chrome. I just don't get it.