You could probe for unannounced channels and publish their funding transactions and channel point. That would be a "value add" in terms of estimating true usage of the network.

Verifiable data points like node count, public channel count, and public capacity.

Anything else used to "build a better model" is not verifiable, so it arguably makes the model worse.

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So what metrics would you use to determine if and how Lightning Network is being adopted and is successful?