All of this is FAA approved! You're not going to fall out of the sky.
Just like how we saw a change on V-Speeds and trim settings going from paper/whizwheel to the Aerodata system, things will change with this as well. I don't have a problem with people questioning this, but I think more often than not the answers to your questions will be, "this is the new, more accurate, way of doing things."
Recently we were holding at 270 and the CI hold speed was 191. Would you have held at 191 or at 250? It is just that 191 seems awfully slow.