OSM-carto's CARTOGRPAHY.md file describes the goals for the "standard" osm.org map style.
The goals of this variant are instead to:
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Show England and Wales access rights ("designation=public_footpath" etc.) using OSM-carto's styles for footway, bridleway and the various tracktypes.
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Show the features that someone might want to walk to and via at zoom level 13 - so show field boundaries, stiles and gates at that lavel.
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Show names for various non-building areas that have names.