Question: Why do some Buddhist texts (sutras and treatises) seem vague, ‘saying something’ yet as if ‘saying nothing’?
Answer: If you feel that their words are ambiguous, it simply means you have yet to grasp the teachings’ true essence. One or all of the following kinds of misunderstanding might be happening –  They might be overly simplified in comprehension – e.g. missing the actual profound implications of the teachings, in terms of principle and practice. This can lead to a sense of lack of fulfilment. Some words we take for granted in everyday life might be loaded with other multiple meanings in the Buddhist context.
 They might be overly complicated in comprehension – e.g. thinking too much and thus missing the straightforward teachings. This can lead to a sense of confusion.  Poor translations might be read, thus leading to understandable confusion and lack of fulfilment.  Alternating between ,  and .
It is thus essential to study Buddhism using good qualified texts as further explained by good qualified teachers, so as to realise the actual worth of the teachings. It can be very humbling and inspiring when the teachings are learnt correctly. And that is the way the teachings are supposed to be learnt!