There are a few different concepts going on here: 1) Which metrics get used in the algorithm? My list was tightly scoped to a process/ecosystem about tracking

There are a few different concepts going on here: 1) Which metrics get used in the algorithm? My list was tightly scoped to a process/ecosystem about tracking the metric of page speed. 2) How is that metric used in the algorithm? Boosting in the score in general? Is the top carousel treated differently? 3) It's also possible the application of the metric can change what is required from that metric. For example: Google regular results require one page speed option, but Google mobile carousel requires a more stringent page speed option. Personally, I am fine with page speed being used as a metric in search results. Context: The main usecase for AMP, and the publishers who support it, are related to news (versus stack overflow, etc). So there is a lot of room for "kim kardashian birthday party" to have very similar content where page speed is a great metric to optimize between them. I am less fine with Google requiring their hosted version of it - especially in the medium/long term once the project has gotten over its experimental phase and proven market adoption.