They are used a lot in both contemporary music and ancient music (gregorian, Renaissance, etc.) as well as learning materials (which let me tell you, are so easy to create using frames in Dorico!) . I know right now we can shorten them individually, but an option to hide them completely would be really nice 
All I can say at the moment is that we definitely plan to implement stemless notes in the future, but I can’t say when this will be.