The current implementation of BlobServiceClientBuilder imposes to use specific authentication policies (original introduced with changeset [^1] and later #7421). However a client may want to use custom authentication policies retrieving credentials dynamically for example. However the current implementations are defined as final which restricts any customization.

I propose the requirement is relaxed, that one can either

• Override the throwOnAnonymousAccess check
• Allow subclassing authentication policies (StorageSharedKeyCredentialPolicy et al.)
• Remove the requirement on specific classes to handle authentication

[^1] https://github.com/Azure/azure-sdk-for-java/pull/22498/files#diff-6a4c707771487be8a5a5a1756dfc0fb7c98af9000ea699b1fc0d354b072dfe7c