Let's put it like this. The main benefits of self-inquiry are not tied to one school of thought. To observe the change in ones thoughts and senses with equanimity does not require anything from old scriptures.
The reason Hindu/Vedantic systems and other systems of spirituality have extra merit is not in what they teach per se, but in the sense of pleasure we get from their poetic expression, and from feeling connected to other practitioners.
That's not to say schools of spirituality have no merit, they do have merit as a social construct, but in terms of self-exploration all you really need is the basic technique and some time to do it.
The reason Hindu/Vedantic systems and other systems of spirituality have extra merit is not in what they teach per se, but in the sense of pleasure we get from their poetic expression, and from feeling connected to other practitioners.
That's not to say schools of spirituality have no merit, they do have merit as a social construct, but in terms of self-exploration all you really need is the basic technique and some time to do it.