I think that the one thing you are missing is mutual masturbation... and what i mean by that is, if a girl is masturbating herself on screen, that it is transferred into the Handy... So that the Handy would match the rhythm and motion of her masturbating herself... that would be an experience and would flip shit on its head, same for girls, if a guy jerks off then she can feel it via a toy...
Just a thought, one of the Scripters managed to do it in one of the 'VR Intimacy' videos and it was fricken awesome!!
https://www.sexlikereal.com/scenes/shes-always-shining-11390