Why George Lucas Cut Han Solo's Cameo In Star Wars: Revenge Of The Sith
The "Star Wars" prequels are a complicated bunch, the result of George Lucas' brain running wild without any restrictions on his creative limits. They're the result of years of worldbuilding that Lucas worked out in his head when creating the original trilogy, expanding on a world of Jedi and Sith that was previously discussed with a shroud of mystery. The prequels have met harsh criticism and more positive re-evaluation over the years, but the events that Lucas introduced have remained vital to the current "Star Wars" canon without the sort of retconning that can accompany unfavorable reception. That's why it's probably for the best that Lucas left out details that would have complicated the current "Star Wars" timeline, such as the strange introduction of a very young Han Solo on the Wookie planet Kashyyyk.
Lucas' list of scrapped ideas for the prequel trilogy included plot twists, different characterizations, and additional cameos. The most notoriously out-there of all his concepts was the explanation of Anakin Skywalker's virgin birth as the result of Force-induced cell division due to Palpatine's midi-chlorian manipulation. On the less wild side, there were plans for Boba Fett to return in "Revenge of the Sith" as part of the Separatists, as well as Qui-Gon Jinn as a Force ghost (which does, indeed, happen in the "Obi-Wan Kenobi" Disney+ series). The biggest character to make an appearance, however, would have been a 10-year-old Han Solo under the care of Chewbacca.
Young Solo
Lucas had originally planned for Han to tell Yoda about the whereabouts of General Grievous due to the signals he received from a transmitter droid. It would have been the only line of dialogue the major character would have gotten, meaning that it was nothing more than a minor cameo and a jokey chance for Lucas to contrast his future "persnickety" characteristics with his upbringing as "an absolute slob." Young Solo got as far as concept art before Lucas decided to scrap the appearance for the sake of a tighter story.
Although it's a small appearance, the brief interaction between Han and Yoda would have muddied the giant, interconnected world of "Star Wars." For one, it's difficult to believe that Han would be skeptical of the mystical powers of the Force after seeing an actual Jedi Master in action. In addition, the Extended Universe material had already established that Han became friends with Chewie after rescuing him from a slave colony. Although the EU isn't considered canon anymore, that detail about Han Solo's backstory influenced the "Solo" film, which does have long-lasting consequences for the current "Star Wars" universe. Besides this, the prequels already had enough characters returning, most notably Boba Fett, C-3PO and R2-D2, and, of course, Chewbacca himself, who for some reason never told Han about personally knowing Yoda. It was for the best not to stir the galactic pot even further.