@Aldis If it is tagged as smut, that means smut IS a core part of the story. A correct example of a smut josei would be Lucia, where the MC is depicted having sex frequently and is sometimes used for character development.
Too often people slap random tags because something happened once, like how Slime Life got a tragedy tag because of a single chapter (that has since been removed), or the occasional gore and sexual violence tags because some blood gets spilled or a terrible author decided to cash in on the casual rape trope.