Here's why:
* No Single Governing Body: Sindhi is spoken in Pakistan and India, with variations in dialects and usage. There isn't a central organization that dictates the language's rules or standardization.
* Multiple Organizations: Several organizations promote and work towards the standardization and preservation of the Sindhi language, each with its own focus and influence. These include:
* The Sindh Textbook Board: This government body in Pakistan is responsible for developing textbooks for schools in Sindh province.
* The Sindhi Adabi Board: This cultural organization promotes Sindhi literature and culture.
* The Sindhi Language Development Authority (SLDA): This organization was established in 2003 in Sindh province, Pakistan, with a focus on promoting the language and its use in various sectors.
* Similar organizations exist in India: These often focus on specific regions or dialects of Sindhi.
So, it's not accurate to speak of a single "Sindhi language authority" with a specific establishment date. Instead, you have various institutions and organizations working towards different aspects of language development and preservation.