One of the fascinating bits surrounding ""Oppenheimer" is that some editing was actually done the old way - by physically cutting and then re-attaching parts of the editing stock - at least for the IMAX prints. Most likely though that involved one of the intermediate film stock emulsions that are used to support the editing and distribution process.
I've not looked into the details of this, but I think they're using the word 'editing' generously/quite specifically. Creative editing will have happened digitally, and then an imax reassembly matching that digital cut might well have been done manually, since printing back to film from scans at that point would unnecessarily degrade the image. Instead, like you say, far more likely that they physically reassembled ('edited') from an intermediate print and then duplicated and scanned that print for distribution.
I imagine there were a number of special effects in Oppenheimer and those were most probably created digitally. So those scenes would have had to be recorded to film in order to cut them in traditionally. But as you say “some editing” those could have just stayed digital.
Mostly correct, except nowdays the digital effects are called
visual effects, and they are often rooted in real photographic elements created by the
special effects department and recorded by camera dept. Once they've done their time in the digital world they do ultimately need to be recorded back to film for the intermediate.
one of the other fascinating sections included details about those of the special effects that they did create and shoot direct to film - no digital creation involved!
Those included some of the images of explosions!
This is one of those gross oversimplifications that have become part of the marketing strategy, and goes to the heart of the OP's original question - why do users favour analogue film products even in a digital workflow.
The special effects that are shot for the film do sometimes make it into the film largely unaltered, but rarely. They will always require some degree of compositing, which inevitably requires some purely digital media to be integrated into the plate. Often, they serve as the best possible reference for the digital technicians to try to recreate, and are replaced entirely, while their secondary lighting and atmospheric effects might be retained or enhanced, or suppressed, as necessary.
But marketing strategies aim to create an aura of authenticity by invoking the memory of techniques which most audience members know only through the very cinematic depictions of those techniques, and which thus are imbued with the romanticism of 'traditional' cinema, when in fact the authentic process has always taken maximum advantage of visual effects, and always invested in technology upgrades which do the work faster and cheaper while also opening up creative techniques that were previously impossible.
Oppenheimer, and every other high profile 'analogue'/'photochemical' movie of recent decades, is full of digital effects, some of which in the past were achieved optically and photochemically, others which couldn't even be imagined, let alone executed, in a purely analogue workflow.
'Film' fans I think both admire the romanticism of old school processes, and are also willing to take experts at their word when they say they did it this way because the final result is of higher quality, in their professional opinion.