Also, I think it's fair to say we all wish to come as close as we can to what the composers vision was/is. But we are mortals, as they were ~ and have our own integrity of expression to consider. For me that doesn't include a merciless insistence on the letter of the law, so to speak. - as long as the integrity of the musical vision is achieved
I wonder what mozart would have written had he had access to a sustain pedal. and bach too. All of the baroch/classical composers that wrote in texture, that removing a key was as important as placing one. They had little choice. We faithfully represent that, but should we always?
I think the integrity is more important than a note. My history of performing on the piano is in rock and jazz, where timing is everything, the notes, not really that important as long as they form a general structure. I remember reading something about someone's interpretation of the rach 3, that is wasn't technically perfect, but it was the best interpretation/performance the narrator had heard. That kinda stuck with me.
Ironically, I started this thread not for the opening chords, but for the apparent technique of holding on notes that the piano sustains, despite the difficulties (big hands)/impossibilities (small hands) of that.
And I wonder, had Rachmaninov gone to the loo at some point instead of staying writing, would it have been different? Did composers really place EVERY note deliberately, or was it, erm, I like that, or definately a diminished 5th of some kind there, or yep, some kind of terminal cadence going in there...

I mean, the 2nd movement was his 2nd attempt, it was nearly never written, the first being pretty but in no way remarkable like the finished article.