Sounds like we are discussing the difference between pressing and leaning. I think there is a clear distinction. Yes, I can stand very close to a wall and press against it, but I don't think that is leaning. I think leaning implies a shared balance, which means I am not in full control of my own balance, regardless of how quickly I can recover it.
I've had many lessons with Susana Miller, and believe me, we were leaning together. I don't mean leaning "on" each other. We were leaning "toward" each other, and sharing our balance. And, yes, I adore this type of connection, because it is so subtle and intimate. When I dance this way, which is as often as possible, I can feel every tiny movement my partner makes (or doesn't), and she can feel mine.
Oh I think we are splitting hairs here - let's not start trying to verbally trip each other up.
Yes I move my partner's weight but that happens in open hold too. Each partner has to control their own balance, how else does a follower instinctively know where to put her foot - it follows the demands of maintaining her balance. She remains in charge of her own weight unless and until I move her body to change her weighted leg, but that just means she is effectively establishing a new axis. I don't do that, she does.
But fundamentally you know the feeling. The question is - can we convert more people to dancing that way so they really can find out what is inside Tango.