Keep the slanderer near you, build him a hut in your courtyard —
For, without soap or water, he will scrub your character clean. ~Kabir
Ancient India post Indus civilization did not have a written language. Therefore the creations of Vedas and the requirements of memory in order to preserve it was the driving force for the believers. It therefore was a constraint to overcome, and in doing so created a class of people beginning from various stock to record and memorize verbally what was central to their lives and to enact the rituals.
Over time,as the volume of the content increased it perhaps became more laborious to try to remember all the relevant information and rituals, that meant the learning had to start early. This created a constraint for the preservers of knowledge (Veda) to become a lineage and over time for it to pass on from father to son and so on. This happened for a period of 1500 yrs before the writing system came to them. A very unique event. The consequence of this kind of development was that knowledge and learning was specific to particular varna-Jatis that developed as a result and the knowledge gained would not reverberate across all of society. And the consciousness of the people as a whole would be fragmented, the concerns fractured, the languages of the people also fragmented.
One notices the learning and who was eligible to acquire it go from a set of general principles to particulars. Consider the Artha Shastra, It speaks of a past referring to schools of similar genre before it.