Just on the people ribbing about the toast at the end of the episode... Copypasting what I wrote on another forum.
What we see in the show is selected parts of everyone's "lives" on the ship, we don't see every single minute of their day or every single interaction they have with each other so we don't get a full idea of how everyone gets along, I take the show, or any show for that matter as showing us a little window into their world and we get to see only selected parts of that to tell a story.
I didn't mind the two parter or the toast because to me what we see are a window of snippets in their lives that make a story we don't see every interaction of everyone, nor do we need to.