LLM Indexing SDKs
A non-obvious benefit of publishing SDKs is that LLMs can index your public code and teach others how to use your API. Without SDKs, there's no public code for LLMs to learn from.
I just searched one of our customers (https://magichour.ai/) on google and saw this from Gemini. (Although in typical LLM fashion, it'll confidently show people an installation command with a typo in it):

Introducing Hybrid Codegen: The Best of Both Worlds for SDK Generation
Combining deterministic reliability with AI intelligence to improve how you build client SDKs
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Sideko's deterministic engine generates reliable, production-ready SDKs, then guided AI customizes workflows to your exact needs.