At certain zoom levels, notably zoom levels 6-7, there are not enough place labels in the OSM vector tiles. I understand the style is meant to replicate the map at openstreetmap.org, but I would expect the tiles themselves to contain more information. For example, Grand Junction is the only place label in Colorado west of Denver at zoom level 7 even though there are many towns there.
Compare the OSM Vector Basemap with this OpenMapTiles map to see what I mean. It has more place labels at every zoom level.
Maps preview – MapTiler
