Like prepositional phrases, certain structural arrangements in English are much more important than the small bones of grammar in its most technical sense. It really wouldn't matter much if we started dropping the s from our plurals. Lots of words get along without it anyway, and in most cases context would be enough to indicate number. Even the distinction between singular and plural verb forms is just as much a polite convention as an essential element of meaning. But the structures, things like passives and prepositional phrases, constitute, among other things, an implicit system of moral philosophy, a view of the world and its presumed meanings, and their misuse therefore often betrays an attitude or value that the user might like to disavow.