Yes, parts have been moved over (but not all of it yet) as early as update 5. Each update will have more and more moved over.
We can argue all day about communication, but 3CX has docs and webinars where they went over new features.
A month to make changes that were warned about in multiple blog posts, emails, and forum posts? I'm amazed - most of my clients would realize in about an hour.
https://www.3cx.com/blog/docs/sms-configuration/
https://www.3cx.com/blog/news/messaging-configuration-u6/
Not ideal, but you make a "dummy" DR with an auto-forward after 1 second to the real DR for each DID and set the routing for each dummy DR where it needs to go.
Probably because they are pushing their new StartUP product and want to unify the code base. But some things will remain in the management console - mostly system settings.
So use the forums, your 3CX partner, and other sources for help instead of 3CX technical support. Or factor in a couple support tickets into your yearly budget - does accounting complain about paying the electric bill?
Change the filter in the upper right to archived and you will see them.