Profound philosophy needs to take into account messiness, but cannot be messy itself in its use of concepts, reasoning etc.
By being strict one can realise the limits of the very cognitive tools we use. Godel and Quine come to mind. The concepts are limiting, but that's all we have in philosophy.
The article mentions some exceptions, but it's a completely different playground. Rumi, Lao Tzu and Buddha were using their teachings as a practical instructions, rather than theories aiming to prove anything about the world.
For instance Rumi composed all his verses in a specific rhythms (obviously lost in translation) that, when sang and danced to, were meant to induce a specific states of mind.
Buddha explicitly said that metaphysical questions are orthogonal to the problem of suffering that he was solving (or just meaningless).
To make things even more complex, there are some similarities between teachings of the Buddha and western pragmatists.
The main problem (or the most fun part) in such discussions, is that there's no common ground to make such inter-paradigm comparisons. We always have to pick one of these viewpoints as a base and compare it to another one from that perspective.