SharePoint - Non root site collection caution

SharePoint allows one to create non root site collection without having a root site collection. For example, you can create a site collection as "http://sharepoint/sites/" without having any site collection at "http://sharepoint".

Caution : Even though SharePoint does not prevent you creating a non-root site collection without a root site collection, not having a root site collection is not a supported configuration. Some SharePoint features break without a root site collection.