I though USA 'biscuits were like our cobblers - found on top of stews or can be sweeter version on fruit desserts - so buttering them sounds odd - but if they more like cheese scones that makes sense.
Like most Southern (US) women, I consider myself an expert on biscuits. They are either a breakfast food, eaten similarly to other breakfast pastries or as a bread item for dinner, like a dinner roll would be. The closest thing in the UK is a scone, but biscuits are (or should be) softer than traditional scones, with a somewhat crispy top. The best ones are made with a soft winter wheat such as Martha White, lard, and buttermilk.
Some people like sausage gravy with biscuits for breakfast, but that is regional within the South and was not part of the cuisine I grew up eating (coastal Deep South).