I think it is rather complicated.
"Art, like morality, consists of drawing the line somewhere." GK Chesterton.
Context and integrity, for example are relevant.
If a photographer presents an image as fairly reflecting reality, when it does not, then that is dishonest. Photography for legal proceedings would be one example, news reporting is another.
The fact that there are other ways of deceiving people, eg by selectively framing the image with the viewfinder, just shows that editing on the computer is not the only way to be dishonest – it does not justify dishonesty by editing.
Nor does the fact that different film types give different rendering justify dishonesty.
Recently a UK politician had his imaged Photoshopped into the photo of an event he had not actually attended. You can imagine that the reaction was not very favourable.
Recently, I tried and failed to capture the Supermoon. I could have created a convincing Supermoon image in Photoshop and posted it on a thread of authentic images of that event. That would have been artistically dishonest, and no doubt would have irritated the photographers who had successfully captured the real thing.
Sometimes I see photos of beautiful sunsets, which are presented as something the photographer saw the previous night. The value of the photo arises from the fact that it authentically presents a beautiful natural phenomenon. If I find out that it has been largely created on the computer, then I lose interest (other than in the technical aspects).
This tells us that in the world of nature photography, people care about authenticity. There is a lot of cynicism today because so many images are significantly manipulated. I am sure we have all been asked the question "Was it really like that or did you just do it in Photoshop?" If the answer is that it really was like that, the viewer is usually impressed. If the answer is that the lovely sunset was actually created by clever use of Photoshop then the response is usually along the lines of "Meh!" (unless the viewer is an admirer of Photoshop skills).
The BBC Wildlife Photographer of the Year Competition and NatGeo have strict rules on the degree of editing allowed. This is because viewers want to know that the images displayed are authentic.
There are other areas where editing is an issue. There is a lot of controversy over manipulating model images to make the model seem much slimmer, with some saying that this encourages anorexia.
On the other hand, many people have no problem with the tidying up of an image, eg by removing the pesky tourist in the pink shirt from in front of the beautiful view.
Editing for art is fine, but if the image is presented as being an authentic representation rather than the artistic vision of the photographer, one then gets into morally ambiguous territory. There are lots of grey areas, and different people will draw the line in different places.
There is a lot more that could be said on this debate, but I think it is clear that there is not one simple answer that fits all circumstances.