YouTube metrics and Twitch analytics are only a single data point in how we decide how to support creators.
My first 3 months on the job consisted of dozens of 1:1 calls with content creators from all backgrounds (among other things). During those calls, these creators shared with me what frustrates them, what they need from us, and what could be leading them to moving away from Overwatch content.
Anyone who has been in a management/leadership/vision setting position knows that strategies and their associated tactics take months to formulate, means test, and drive alignment behind. Taking in data from as many different sources as possible is an integral part of that process.