The level of nitpicking that goes on never ceases to amaze me.
If Harmy is going to be called out for something so miniscule, then I might as well be taken to task for the 5.1 tracks that accompany these releases. In several respects I make creative edits that don't necessarily duplicate the original audio mixes to 100% accuracy in all technical respects. But what I do sounds damn good, and replicates the spirit of the original work very convincingly. For its intended purpose, it's far and away the best that can be done with the source material available, and nobody has ever really had a problem with it that I'm aware of. I stand by what I do—just as I support Harmy's judgement in the visual aspects.
As it happens, film prints actually do have rounded corners, and given that these movies were shot on film, it's not like such a thing is coming out of nowhere. As has been mentioned above, cropping of the image is always going to occur to some degree on any presentation, and each copy will be cropped slightly differently, for a variety of reasons. There is nothing to suggest that the Bluray version is somehow a completely reliable record of every single scrap of sacred picture information, or that losing a miniscule amount at the edge to accommodate the needs of the venue somehow violates the sanctity of the movie experience.
At the end of the day, this is not a complete restoration as such. The stated goal is to recreate the experience of watching the original versions of the movies, starting from the special edition and working backwards. It isn't the actual untouched original in every aspect (and neither are my audio tracks, for that matter). With the advent of 35mm sources for some shots, the project has evolved into taking on a more film-like appearance, which I think is awesome. But sometimes the film-like qualities have to be replicated digitally (which is now possible with recent developments in analog modelling), and as such a certain degree of creative judgement is called for in applying them. But to call this project a fan edit is very misleading, and inappropriately dismissive of its nature and intentions.
When all is said and done, we want to be able to just sit down and watch these movies like we were kids again. If anybody is going to let a tiny part of the very edge of the frame ruin that experience for themselves, then they are in a strangely confused state of mind and ought to re-examine their priorities.