I often daven at Chabad shuls and I have noticed that they have some particulars regarding tallit usage inconsistent with the rest of Ashkenazi Jewry, including:
- not wearing when receiving an aliyah or davening (even shacharit)
- not wearing for leining
- Chabad Ba'alei Teshuva discontinue the wearing of a tallit when the "become fromm"
I have read, in sources related to MMS that it is for the kavod of the kehilla and of the sefer torah that we do so. Furthermore, when I discussed this with R' Avram Grossbaum of Chabad, he provided a rationale which does not work in context, that of a minyan of bachurim.
Does Minhag Lubavitch bring any sources for their rationale?