You’ve all brought up the sichos and iggros a few times, can we talk about those? Rav Breuer ZT”L once said that any psak halacha that is not explicitly written down and published is a Horo’as Sho and cannot be relied up except for the specific person it was given to. Most Chassidish, Litvish, and Sephardish Rabbonim hold of this to varying degrees. The most well-known example is probably “Iggros Moshe”, 8 chelakim were edited and compiled by Rav Moshe Feinstein ZT”L himself and people still rely on them for piskei halachos. One chelek was put out by his children and is still a massive point of controversy as to whether we paskin like it or not.
But by Lubavitch, it’s the complete opposite. Every letter of inspiration written to some Russian apikores, every burp during a speech, every “Mazal Tov” given at a chasuna, is scrutinized and analyzed like it’s Torahs Moshe l’havdil. Furthermore, it’s well known that after he had his stroke, people claimed that Rav Schneerson ZT”L was saying all sorts of things, each one more outlandish than the last. I personally heard from one of his frum doctors that on his deathbed, they had a difficult time dealing with the constant stream of Chabadskers who would put their ears to his lips and run out crying because they took a subconscious mumble to be an admission that he’s Moshiach.
So sure, you can state that certain practices and beliefs are acceptable because the Rebbe said this or that, but don’t get upset when we call it problematic because you chose to interpret his letters in a certain (probably incorrect) way. What he allegedly said in sichos about “Navi HaDor”, and what he may or may not have written in letters about davening to dead people, is nothing more than an interesting vort at best, but more like a historical curiosities and הפקר ובטל כאפרא דארע.