Besides the "show everything you can" vs "clean" approaches, I think there is a "topo map" vs "web map" difference in approach. I'm not sure if it's a coincidence or due to cooperation, but Ordnance Survey topos and USGS topos look fairly similar. I've long looked at the USGS topos as really nice maps worthy of emulation. On those, dirt roads are shown in a thinner line. Making the casing dashed sounds quite sensible.
In my town, there are only a few dirt roads, but knowing if a road is dirt of paved is important to normal people looking at maps. So I think the default rendering should show roads (highway=primary/secondary/tertiary/unclassified/residential/service) that are marked unpaved. Probably more can be done, but just making the casings dashed on those would be a large fraction of the benefit without much downside.
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