Why does DNS impose a limit on the key length?

DNS imposes a limit on key length primarily for performance and compatibility reasons. Longer keys can increase the time required for DNS lookups and processing, potentially leading to slower network performance. Additionally, many systems and protocols interacting with DNS have their own limitations, so maintaining a standardized key length ensures broader interoperability across different platforms and applications. This balance between security and efficiency is crucial for the overall functionality of the DNS infrastructure.