If we have mods usage statistics, we could know which mod needs to be maintained and which can be removed.
Add an option to allow users to upload their mods usage.
Keep it as it is: add mods and remove them at someday.
We can also collect more statistics, like tileset usage, system, and version.
Of course, this is optional and is turned off by default.
While I think it'd be cool to see the data, I don't think has much bearing on which mods are kept and removed, that's more a matter of someone maintaining it and it fitting within the mod guidelines.
There are several aspects to this. For security reasons, I am adamant that the game executable should not talk to the network. It would be fine to have the game executable write statistics to a file and then have a seperate executable push those statistics, but that also requires someone to write and maintain said statistics aggregator. This is a large and involved task, which needs a lot more care and interest than, "it would be nice if... ".
The other aspect is the core of the issue, which is driving mod maintenance based on usage statistics, which is a vanishingly unlikely proposition. Maintenance is based on developer interest, not feature utilization, so at best such a statistic would be informative rather than imperative.
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While I think it'd be cool to see the data, I don't think has much bearing on which mods are kept and removed, that's more a matter of someone maintaining it and it fitting within the mod guidelines.