This subject never seems to go away.
Have been teaching both Amer. and Intern styles for over fifty yrs .
The non contact approach, is very typical of the Amer. chain school, particularly at Bronze social level .
most teachers new to their system. are trained in this manner . They, in many cases, never evolve beyond that approach. The 2 camps ( closed and open ) seldom seem to agree on a fundamental technique.
Yes, it is possible to lead with space between the partners-- that has never been denied. What is more the crux of the discussion, is the result one can get from a closed or open position, resulting from body rotation in closed, as opposed to an apart position.The frame, to my mind, when a non contact approach is used, tends to become a tad more rigid .The transmission of lead , tends to be more arm lead than body .
There is a reason why the apart system was incorporated into the Amer. system. One has to go back to the inception of partnership dancing as taught in the 20s 30s and40,s ( and still today in most schools ) .
The majority of single ladies ( much the same today ) were of an older generation, and close contact, as in dance , would be an invasion of their privacy .
If you have a level of competancy to the silver standard in Intern., you would find it extremely difficult to acquire a satisfactory result , with distance between the partnership ( pivots being a prime e.g. )
We know all the theories about leading with one hand, but lets talk practicality. When I move in a given direction, my body ( hopefully ) transmits a signal that will give a positive response .
By the way-- the hips should not touch in Tango-- the corect body positioning near prevents this, als o, the word " chest " gives a bad connotation . Core or centre would be more appropriate .
Bottom line--dance that which makes you comfortable. You may evolve, given time, as all dancers do, for better or for worse .Its really up to you !