Why does Plug.Static not define an cache expiration date by default?

Questions & Help Questions
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If the request query string starts with “?vsn=”, Plug.Static assumes the application is versioning assets and does not set the ETag header, meaning the cache behaviour will be specified solely by the cache_control_for_vsn_requests config, which defaults to "public, max-age=31536000".

That’s the default for phoenix when using static_path though, which is explicitly not using etags. Though I’m not really sure as to why exactly.