The rules of the Brahmanical text were not universally followed in ancient times due to various reasons:

1. Regional variations: Different regions had their own customs and traditions, which sometimes conflicted with the rules prescribed in the Brahmanical texts.

2. Social stratification: The caste system was not strictly adhered to in all parts of India. Some communities did not follow the traditional fourfold varna system and had their own social hierarchy.

3. Influence of other religions: Buddhism, Jainism, and other non-Brahmanical religions challenged the authority of the Brahmanical texts and their rules.

4. Individual beliefs and practices: People had their own interpretations of the Brahmanical texts and followed them according to their own understanding.

5. Lack of enforcement: The rules of the Brahmanical texts were not enforced uniformly across the country. The authority of the Brahmins was limited in some regions, and other social groups had their own leaders and authorities.

Thus, it can be concluded that the rules of the Brahmanical texts were not universally followed in ancient times due to regional variations, social stratification, influence of other religions, individual beliefs and practices, and lack of enforcement.

It is because there are many religions in world and each religion have their own rules and regulations