mariner:
If you had even a clue what you were talking about, it would demonstrate a sad state of affairs on your part. Since you don’t, its hardly even funny.
Like some people mentioned earlier, some Litvish Roshei Yeshivos, like Yeshiva ChaimBerlin/Hagoen Rav Ahron Schecter, hold that Choson/Kallah must hold hands after the Chupa. So all your tainos regarding the mitzvah tantz listed, would apply no less to these Litvish Roshei Yeshivos. You display simple ignorance.
Secondly, the mitzvah tantz DOES shtam from the Machzor Vitri, despite your demonstrated lack of knowledge thereof. Machzor Vitri holds from the mitzvah tantz based on the Gemora of keitzad mirakdim. Those Yidden who’s minhig includes a mitzvah tantz, do so based upon the machzor vitri.
Thirdly, Minhug K’Halacha. Your comments reek from ignorance. The minhigum Chasidim maintain, by and large have been practiced for many centuries prior to the Baal Shem Tov. Mitzvah Tantz, Upsherin, Shmini Atzeres out the Succah, No tefillin Chol Hamoed, Nusach Sfard or Nusach Ari Hakodesh, etc. etc. etc. The list goes on.
These holy minhugim have been established by Chazal long long ago. And your trash talking of these helige minhugim is a reflection of you, not of Chazal who established these practices.