I agree on the sound- it was likely nominated for best sound simply for some of the sound effects, but it really shouldn't have been. That was the least deserving of all nominations this year.
As I pointed out earlier, I agree about the dialogue. Like the sound, it's a common criticism of Nolan movies - he does not write dialogue well at all.
I disagree on the editing choices. In prior Nolan movies, the "time skips" are essentially at worst, just a gimmick, for entertainment purposes, or in the best cases, to build excitement. In Oppenheimer the order in which the story is told supports the themes of the movie, they are ordered with a thematic purpose. While throwing out the traditional three part act from a narrative standpoint, it IS constructed in a three part act from a thematic standpoint. Quentin Tarantino did something similar with Pulp Fiction, took an otherwise unsuspenseful story and ordered the scenes like you would a piece of music, to maximize emotional change and impact, rather than tell a chronological story. Nolan does the same with Oppenheimer, structures the story to best support the questions and messages the movie is conveying. The movie's purpose isn't just a retelling of historical facts, one can just go look up and read a textbook for that. I believe his artistic purpose is to use historical events that the viewers may be able to emotionally connect with in order to convey all the messages he has to tell on the topics of economics, politics, bureaucracy, power, patriotism, personal morals, and what I think was most important, one's actions and the long term impact, chain reaction causality they have on personal relationships and personal connections. If it wasn't mankind or earth being destroyed by his actions, with fallout being something to deal with after, it was his own personal world and those close to him that were being destroyed with the fallout effects after.
Ranking Nolan movies I've seen:
Top Tier:
1. Oppenheimer
2. The Dark Knight
Still 5/5 movies, just not the masterpieces like The Dark Knight is:
3. Inception
4. Interstellar
5. Memento
4/5 rated movies, rewatchable:
6. The Dark Knight Rises
7. Dunkirk
3/5, still better than most movies of their genre and worth seeing:
8. Insomnia
9. The Prestige
10. Batman Begins
11. Tenet