You know what's weird? The fact that no one in the star wars universe invented a smartphone. Like, they have sentient robots, spaceships, and holograms, but no one is using anything that resembles a smartphone. Sure, they can send holographic messages to each other, letting people know there is a clone army on Kamino, or that they are each other's only hope, but you never see anyone doom-scrolling through Geonosis's version of Facebook, or posting memes about the empire. No one is sharing pictures of their Kowakian monkey-lizard or videos from that one Bantha trip they took on Utapau.
And wouldn't you assume C3PO and R2D2 wouldn't get lost on Tatooine if they had a built-in GPS system? And why wouldn't they? Sure, C3PO is just a protocol droid but R2?! He's like a Swiss army knife on wheels! Do you want to tell me he has two jetpacks built into his legs but no GPS system?!
Pretty sure he didn't destroy several galaxies but I will allow it
Same reason Luke had a green saber in Return of the Jedi - So it wouldn't clash with the blue sky of Tatooine