I don’t think those features are as essential for them at the moment as it would seem at first thought.
Many people before switching to a new main current account would want to test it out before fully switching or have some decent reviews. To test a banking app out, you definitely don’t need to use the CASS service and you don’t really need to use DDs as you can just use your normal account for these.
The things that are missing aren’t important for people testing the app out, which is what most people will be doing at the moment.
I can’t see many people switching fully to them this soon to it opening, even with CASS and DDs, so I doubt they are losing that much.
Obviously it would be more useful to have the normal CASS system and DDs, but for Chase, they won’t be necessary straight away.