What unwholesome sankharas can be created from too much focus on dhamma concepts, reading and intellectual pursuits, and practice?
What kind of results do those sankharas produce?
What blockades are created?
What are the common associative thinking patterns and behaviours that emerge out of persistent preoccupation with dhamma concepts?
In the Mahayana tradition, Japanese Zen Master Hakuin, has this to say:
“People see it as if it is far away. What a pity! They are like a man who, standing in water, complains of thirst”
In the Theravada tradition, they have a similar outlook, gesturing their practitioners to not become fixated on the signs and features of their perceptions, which should include dhamma concepts. Although helpful at the outset, a hindrance may develop, and this is Theravada's recognition of that hindrance alongside many others.
In my own understanding, I have this to say about it:
The Plateau of Diminishing Returns
It is only when all effort has been exhausted that the seeker lays down their ordinance and armaments amounting to their spiritual techniques, their religious paraphernalia, and their pride. This might happen to be rather elongated and messy affair, but never mind. From here onwards, one becomes strikingly honest with oneself and receives absolutely nothing in return.