Thing is that one of the biggest source of feedback was concern about cross compatability (which honestly from a marketing POV is good for FFG too. people'll buy black crusade sourcebooks for their dark heresy game etc) FFG may not have been able to strip some but not everything if they where gonna keep it cross compatable
The irony of this being that it's about as easy to convert DH1 stuff to the DH2 rules as it would have been to convert them to the old beta's rules. This system isn't really that backwards compatible with older ones, as most of the damage values are different, psyker rules are different, talents and skill rules are different, unnatural attributes are different, NPC construction is different, basic skill resolution and degrees of success are different, vehicles are different, and other things I'm sure. Unless someone converting stuff over only really cares about wounds and other stats keeping the same name, this isn't really any different to convert to than the old beta was. There's a reason (other than distancing from older game lines) that this game offers no guidance on how to convert.