The Rechtschreibrat is tasked with codifying existing changes to the language, not inventing something new.
Capital ß does not exist and never did. Before a few years ago when Unicode accepted it and a handful of designers played with it, there was exactly one documented occurence in hundreds of years of the language: the title page of one singular run of an orthography book in the GDR. The runs before and after that had SS.
I think there should have been an uprising (violent, if necessary) in 1996, but the ship has sailed. Very few people care about their language. Heck, most people get the simplest parts of orthography wrong and imitate English patterns (even the famous contatenative property is dying, people are just writing constituent words serially, with space in between).
Never forgive, never forget.