I really think to Owen it's just like if I had a shovel in the shed for 9 years, and then later, someone had painted the handle and sharpened it and polished the wood...I wouldn't recognize it.
They're just special characters to us 'cause we follow them on their adventures, and G.Luc imbued them with extra personality for reasons of story-telling.
I don't think they somehow magically "became real boys" like Pinnochio.
Whenever you see another protocol droid, they look the same and have a similar voice and mannerisms.
I really find more offensively stupid, things like, He created Boba Fett just as a throw away character, designed to get Han's body to Jabba. That's why he did/said so little and died so lamely.
But I've heard him say with his own mouth that Boba Fett never had any real significance to him, but AFTER he saw what a fan favorite he was, he decided to try and work him into the prequels, as the son of the "father" of the entire Imperial army.
That's not the cool way to develop a story. It's embarrassing, akin to what people call "selling out" or "pandering".
The original GOOD movies were great because they didn't pander.
Stuff like, just jumping in on episode 4 from the start, with Leia being chased by a giant ship, and expecting YOU to have the brains to follow along and get accustomed to this new world.
And having the great, fabled Jedi bad-ass be a tiny green old man who waddles around scrounging candy bars.