I also used to work on this ecosystem, and I agree with this analysis. We regularly found cases where the routing system did not route to the preferred provider

I also used to work on this ecosystem, and I agree with this analysis. We regularly found cases where the routing system did not route to the preferred provider, despite the routing system knowing that the user was eligible to play a streamable result on the preferred provider and not on other providers. The experience would dead-end in a way that was invisible to the organization tracking KPIs of the preferred provider, since the playback attempt landed in another org's system, and would penalize the KPIs of the actual destination, even though they couldn't service the request with a playable result. Despite every music service provider being penalized in this way (and providing crappier CX), we were not able to get the Alexa organizations in question to prioritize whatever the investigation and fix required.