Still plenty of time for them to fit those conversations into the story. They certainly didn't miss their opportunities. They're simple to do that the audience will largely understand, add to character depth, and are short and easily adapted to the screen. There are other subtle parts in the book that I can understand them omitting, like Tyrion's first encounter with Jon Snow and Snow's impressions of him as he leaves, but those things are no-brainers.
But Stannis already met Renly? And there was no peach? Unless they deviate a lot from the book, I doubt very much they'll meet again.