If you say that languages are how people slice up the world, and this makes different languages harder or easier to learn, you're committing to some form of Sap

If you say that languages are how people slice up the world, and this makes different languages harder or easier to learn, you're committing to some form of Sapir-Worf, however mild. "I have the English way of slicing up the world and it's hard to adjust to the Japanese way of slicing up the world". An alternate explanation is, as I argued, that the differences between human languages are superficial and the underlying (and more interesting) concept of language is the same for everyone. If that's true, the differences between languages are minutia.