Some people use the tertiary, I think, and some don't. Probably takes time or certain circumstances for some to start recognizing the need for it.
The only thing I'd say is it'd be pushing it to say the inferior can be used in any kind of productive light (not without maturity). Every thing written about MBTI would say as much. In my own experience, I don't think I've made a lot of progress. Te is truly the shadow side, and it's expressed with intimidation or straight up beating ass (most of the time undeserved).