ZD,
R Wallerstein never said that “thus they can do all sorts of things that are Ossur” as you are advocating.
Nor did he say that one should discourage someone who is trying to improve their ruchniyos, which you too are attempting.
Sound more like Dov Linzer’s “brilliant” remarks on his recent podcast. Where he laughingly portrayed something that is ossur as being a mitzvah.