Even for natives of those cultures, penetrating that philosophy often takes years of spiritual practise and training. The reason is that it isn't about ideas, it's an actual body-mind training and transformation of being. It isn't something you just sit and talk about and discuss, although it can include that, but also it must come with actual implementation to occur.
That's the main difference I've noticed between western philosophy and eastern philosophy which makes them difficult to integrate. The former is almost always understood by the experience of so-called "ordinary beings" and communicated in terms of intellectual arguments, whereas the latter cannot really be understood unless you actually physically and spiritually transform your very being.
For example, I used to practise Soto Zen, and Dogen's philosophical writings are very popular there. Western philosophers, or just general non-practitioners, absolutely bash their heads against his writing, it's just so difficult to wrangle and there's no connection. In Soto Zen we understand it by sitting zazen (seated meditation). Literally, the only way I know to understand it is by doing meditation practise. Then next time you read it and you have a deep connection with it that you can't explain in a way that someone who hasn't had that connection would understand. Western philosophy seems to not be compatible with those kinds of transformations. If it cannot be explained in a way that is somehow independent of the observer's own practise, then it is not considered rigorous, but also such a thing is impossible when talking, for example, about Zen.