One thing that bugs me and I guess others is if Luke is so important why does Ben leave him with Owen at all?

Why doesn't he start training him from the moment he can understand words (like any other Temple Jedi)?

Leia is hidden and maybe training them both would risk exposing their spare Skywalker but leaving Luke in the company of a guy so hostile to crazy old wizards and their crusades (for no reason) doesn't make sense currently.

Maybe if there was something mystical protecting Luke at the farm (like Shmi's ghost).

That could explain why Owen doesn't want Luke to spend too much time away from the farm (he seems to begrudge even his trips to Tosche Station).

How that could be injected into the PT is another problem.

Not unless you recast Owen or/and Beru and get them to say other lines.

The PT is so full of pointless exposition this is one instance where a few lines could have added colour and depth to the story.

What if the whole planet is avoided by Jedi and Sith because it dampens their powers or something.

Maul has to use probes, Anakin has lots of magic space bugs but still crashes pods.

It might prove the ideal place to hide Luke but the worst place to train him.