Which, I think was to the PT's trilogy detriment, as seeing more of Obi-Wan and Anakin was an aspect that I really wanted developed.
I get that the structure of the PT went through some iterations, I just think that the Anakin/Obi-Wan relationship could have used a little bit more focus.
I don't disagree, but the way these movies are made that would mean sacrificing something else, which in turn has a knock-on effect that alters the structure and pace of the whole movie. Such decisions are made fairly early on and generally require page one rewrites if altered. It also doesn't help that this is the kind of problem that doesn't often become apparent before the movie is done shooting. At which point, it's rarely worth it.
I just think it would have been more interesting and dynamic to see Anakin's fall from grace as perceived by Obi-Wan, just like we get to know Vader as Luke's father through Luke.
But again, it's not the story of Anakin & Obi-Wan in which Anakin falls to the dark side, it's the story of Anakin who falls to the dark side. There's a subtle difference, especially if one were to view all six Lucas movies as "the Saga of Anakin Skywalker". Making Kenobi a POV character in the PT wouldn't make thematic sense given his utter lack of a character arc in the OT.
It's easy to forget he's only really a supporting character in ANH. Doesn't show up until the 30min mark, only has half a dozen scenes with Luke, disappears for half of the second act and is promptly killed off by the villain. He's an important character to be sure, but there's no arc there. He helps Luke in his "call to action", gives him some exposition and them his story just ends.