Having a up-to-date Cubase licence/key as well enables me to do that all the time, but I feel always a little bad when paying another 400 EUR for a Nuendo upgrade which is almost a Cubase licence (not fully but I might get my point).
I am fine with that because it is my decision to handle it that way - but basically I am paying twice for usually just using one application (because I only have two ears and one brain).
So I voted Yay because I fully agree with what Marsman wrote and it would be just a fair move from Steinberg.