Daily Challenge RCs

I don't understand why the people here say that solving the jargon-heavy RCs in the daily challenge will help you solve the actual CAT RCs more easily. The people saying we need to solve DIFFICULT RCs and asking for even tougher ones- don't you guys think solving the CAT-relevant RCs will help you more than such overly dense and irrelevant ones? Solving such "difficult" ones won't magically make you immune to the actual ones. You need to develop actual skills, which you can build by practising the RCs at par with the CAT. Confusing these with high-quality is a mistake. Also, I'm only talking about the passages here; the questions are undoubtedly good.