We lose the POV of Anakin, because he's considered "lost"
You're agreeing with me. After EP3 we no longer see thing from Anakins perspective because his perspective changes. So we can't see things from his point of veiw through all six film.
When Anakin is lost to Obi-Wan and Yoda he is also lost to us. It's one of the most genius things about the prequels.
R2 and 3PO didn't have there usual role in TPM but they still had to be introduced. Maybe it's they way they were introduced that you didn't like. I loved it but it I would have liked it just as much if they had been introduced another way. B
But they had to be introduced because they are key to how we see the later films.
Jabba is an example of a redundant OT characte in TPM. But the droids are important and had to be introduced.