For that matter, they are all the descendants of Yaakov Avinu. Why don’t they mention that? What greater yichus can you have than that?
I imagine that was said in jest. It is obviously very different – people announce Yichus as a sign of pride or prestige; it involves having lineage that others don’t. Whatever the ma’aleh of Yichus is, you trace yourselves to someone special. My question was why they all stop at the Chasam Sofer, but don’t continue one extra generation to his shver, R’ Akiva Eiger.