In context of deriving a timeline for the Indian history, Mr. Arya discusses the origins of the Sanskrit language. He classifies the Sanskrit literature timeline into three - ancient, transitional and modern. Here modern - means Ramayana and onward. He posits that Sanskrit is NOT a natural language. This language is based on grammar and (was) developed to perfect a language. He compares this to today's computer languages. Computer languages are technically languages, but not natural languages, are artificially created. The computer languages are subject to rigorous syntactical rules for consumption of computers, not for humans. During the Veda period, the grammar of Sanskrit was loose. Then its grammar evolved and matured further. He says आगन्तास्मि used in Vedas is considered invalid (दोषपूर्ण) in post-Vedic period. However, this observation is incorrect. This usage is still valid in today's Sanskrit.
Anyways, Mr. Arya's analysis strongly suggests the Sanskrit language was mainly a link language and not attached to any region, community or geography. In Ramayana, Hanuman's thoughts of how to present himself to Sita also suggest that Sanskrit as a link language. This was echoed in couple of my posts. One of them - Sanskrit - Is it a language? discussing how Sanskrit is different from other languages. The other post - The Tale of a Car - Why We Should Keep the Sanctity of Sanskrit Language.