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I agree with the sentiment but the example is not very compelling. Tracking averages is its own pit of problems.

To be able to understand your funnel in a marketplace you’ll need to at least track profile and product views & click-throughs in addition to the metrics mentioned. How can you possibly tell what’s wrong when all you have is a average GMV metric going down?

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I agree, but I think there is a difference between metrics and having data to investigate. A metric is a value you are tracking over time, but when something changes you will likely need to do an investigation. That investigation might be the raw data, it might be some dynamic queries or it might be other metrics.

Tracking metrics because you think they might be useful in the future for diagnosing other problems doesn't make sense with modern systems as dynamic queries are so fast.

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