I'd say it at least should be a key differentiator. But I don't know if there's an reasonable chance of that happenning in WTF "elite" sparring.
Or maybe WTF practitioners are just not trained with that option in mind. Maybe if their coaches admited that option and started exploring that aspect of sparring even shihap kyorugi would look a little more interesting. Maybe...
Sometimes it just takes one new guy to start doing things differently and find success with an unconventional method to change the look of a sport. Fighters just have to think creatively.