Hello,
The OSM definition of a suburb (https://wiki.openstreetmap.org/wiki/Tag:place%3Dsuburb) is different to what would typically be called a suburb in North America and is roughly equivalent to what would be called a neighbourhood (whereas to osm tag for neighbourhood refers to smaller areas within suburbs). As many areas tagged as neighbourhoods in New York have there own distinct identity eg. Jamaica, I thought they would be more appropriately  tagged as suburb rather than neighbourhood.