Thanks for your reply. I was just going by the new version announcement, which sounded like some major changes might have been in store. I'm glad to hear that nothing is being forced on us, a la that Pocket feature in the other browser.
I'm going to start keeping a list of websites that upon starting to load still insist that I must "disable your ad-blocker" or access will not be granted -- despite the fact that it remains disabled by default, which setting I have not altered. When there is enough of a list, I will update this thread, and then you will be able to see for yourself. They must be detecting something that raises their objection. (I get it: they insist on having their ad-serving revenue unimpeded. With another browser that used to support extensions like Remove It Permanently and the rather selective Nuke Everything, and of course NoScript, I had multiple ways of evading the ad clutter.) If so, and there is no way to further "stealth-isize" this with Opera, so that sites can't detect the counter-measures, I will have to continue such site access via the method I mentioned.