> the notation is overly verbose and specific
That's what formal notation is like. The advantage of a formal notation is that it is both succinct and fully precise, and can, therefore, be used to perform formal proofs, possibly using a mechanical proof checker. Formal proofs are especially important in computer science, where theorems about programs are not mathematically deep but do have a lot of details that can be easily overlooked when reasoning informally. Lamport's talk was precisely about that: formal reasoning about algorithms. In that context, the ideas must not only need to be communicated so that they are intuitively or roughly understood -- as is good enough for math -- but made absolutely precise.