It is okay to have a feature (NOT necessarily this feature) that translates other conventions to a single consistent convention; for example a language may convert a name "foo_bar" into "fooBar" when used in C bindings, preferably with an escape hatch. However case-agnostic languages do not try to do that, they give zero indication for what convention to use (cf. function names in PHP, which is a horrible mess). No single convention is better than others, but a single consistent convention does matter.