SHY: “all I said is that some Chassidim won’t place any other Sefer on top of a Tanya… There is no Halacha that says that one MUST place certain Seforim on top of others.”
You’re right that there is no halacha that one MUST place certain sefarim on top of others, but it is still improper if someone doesn’t do so because he “feels” that it is more respectful this way even though halachically there is nothing wrong with it.
“Feeling” this way is tantamount to saying, if I had written the halacha I would have done so differently.
Or perhaps I’m dealing with a Chagas chassid here…