Related to this, the old assistant view was far superior to the multiple editors we have now. I really want the "second editor" to go back to being the assistant view, and have history, previews, etc. all open there. As it is now, I always have a second editor open on the right, which means that when a preview opens (or the history navigator), that editor gets split so it's only 1/4 of the screen which is not usable for me, even on a 34" monitor.
If we had the assistant view back, opening previews automatically wouldn't be so frustrating. But it's not an option in Settings -> Navigation -> Optional Navigation.