Okay, this is very easy. Having NO option to how this works is the bad UI design. All I, and probably most, are asking for is a simple option to turn this off. This is no different than what has existed in the Mac Finder for decades. "Show warning before emptying the Trash." (see below)
In iOS, this would be a slider button that says "ask before deleting" or something similar. I'm not perfect, but when I go through the actual motion of swiping left with the intention of deleting, I usually know what I am doing.
The fact that Apple has changed the way this interaction works, with the thousands of muscle memory motions that millions of people have developed in dealing with this, is the great frustration. Getting this change, unexpected as it is, makes most educated users go looking for an option to turn it off so it will work like we expect/desire. Having no option is what is so frustrating. Apple, in their ever-overloardy way, most often seems to think they know best. It seems that the bigger they get, the more often they get it wrong. You can see this in the complaints of people (like myself) who have been using their products since the original Macintosh and see how the 'ease of use' has become the frustration of tap and peck to figure out how to use things. Tons of features, useful features, aren't clearly documented or explained. We now have to "google" how to use our multi-100 or 1000 $ devices because there are no manuals or user guides. And even when we know how to do that, we run into UI choices like this that cause great consternation. So fine, people can disagree, but I don't know how one can disagree that the option to turn off this "feature" is beneficial.