Yechi, no, I do not agree that yat”k was ever a major day for chasidim until the last rebbe made it so. I don’t think it was any bigger than 21 kislev is for Satmar.
As for the 250 seforim chabad rebbes have; no one learns them all. It would be virtually impossible. Most bochurim learn likutei sichos, tanya, igros, likutei torah, and not much else – which is still a tremendous amount of learning, more than enough to confuse young people into not understanding basic yiddishkeit amid a sea of kabalistic concepts – pardon my snarkiness.
There were no indicators that the missionaries were aware of that there were bochurim in my yeshiva, or the other yeshivos that they visit, who are interested in chabad. None. They go everywhere on yat”k, simchas torah, and other times, to spread chasidus to everyone and anyone.
Most yeshivos throw them out or threaten to call the police, especially when alcohol is being offered to minors. My yeshiva is kinder, but no one was interested. they just wanted to eat their supper in peace. This has been going on for decades.
Do you agree that chabad is not necessary learning to be a good Jew? Do you think litvishe bochurim, with or without n”h, can be ovdei Hashem and bnei olam haba if they spend their lives in shas and poskim, and don’t ever think that they’re ready for kabalah(as is the case with many roshei yeshiva)?
And do you think a chabad chossid, or any chossid, is inherently superior to a litvak, because they are aware of chasidishe torah?
This is coming from someone who has spent years learning chasidishe seforim, alongside ramchal, gaon, n”h, shl”a, etc..