As I understand it, and it has been discussed extensively in the forum, they didn’t limit anything that is on the home automation side. There are still virtual switches, there are certainly still button controllers.
But the ADT/SmartThings hub has two separate Silos. The one that is able to contact the ADT monitoring center is, indeed, as you mentioned quite limited. Only the dual logo devices can trigger a call, and some of the features are not available to anything except the built-in automations.
That may be exactly what you meant if you were just referring to the ADT side of it, I just wanted to clarify.
There’s a lot of discussion about all of this in the following active thread: