Ok, I can see bigs being better ball handlers and shooters in general, though I'd argue that doesn't mean they are more skilled. It means they were skilled in different areas. You could probably say that big men back then had better footwork and finishing ability in the post.
If by hall handling you mean dribbling around. I guess that's probably true, but I don't think that's always a good thing. For every impressive feat of ball handling that we see that leads to a score, we see at least one play that leads to a turnover or a bad shot.
I agree with the athleticism point, though I think that might be a little overrated as far as it relates to the game.
Thanks for the straight answer.