To jent:
For once, I will take exception to what you wrote:
“..we think its fair to say that its more oigehalten the mitzvah tantz then the minhuk of bringing kalleh with chasen in middle”
I say this with utmost respect to you, but Why is the minhag which was practiced by the Litvishe communities in Lita less oisgehalten than the chassidish minhag??? As I see it, a minhag is not to be thrown away so easily. Many might not know this but in Lita (I know Telz for sure), they had the minhag of bringing the kallah in and having the bochurim and men dance before her. In any case, what was the point in even comparing the two minhagim?? Each one can stand alone on its own merits!
Nowadays, the whole concept of keeping men away from women in the Torah world has been increased, we are much more concerned with the mixing of the two than they were a few generations ago. Also, some may claim that the bachur of today is not on the madreiga of the bachur of yesteryear. So that is probably the reason why some Roshei Yeshiva of today are against the practice of having the Kallah come into the men. (I know of one very Choshuv Rosh Yeshiva who insists upon it by his children to uphold the minhag)
Also, I’m rereading your post, I don’t see how you even attempted to explain to nameless what the “problem” may be.