Sure there's some of it in the OT, but a tiny fraction compared to the PT. There's a difference between conveying useful information and just doing it for the sake of doing it. The OT had the right balance, and rarely did it seem forced. Have you even seen TPM? HALF the dialogue is someone explaining what is happening onscreen. I don't think it's a deliberate plot device. It's called Lucas trying desperately to fill in holes in his otherwise completely droll and inept script.