What does “get somebody so far” means?

[Saraj Zhou]

Brazil’s burden is nearing 100% of GDP. fiscal incontinence in developing countries often leads to inflation. High yields are needed to compensate for that risk. But such explanations only get you so far. [from The Economist]

What does “get somebody so far” means?

 

[jutfrank]

But such explanations only get you so far.

This sentence means that although such explanations are useful, they cannot account for many cases.