With just the DH you will have full primary control.... you don't need CoRE.
In addition to the slider bar within the device view itself, native apps like smart lighting and routines can control on / off / dim no problem, but they won't respond to the scene ID's rendering S2 fairly useless.
If you find CoRE a bit to complicated (and it is) you could use the Fibaro dimmer scenes app by @hajar
CoRE gives you extreme control with options such as IF, AND, OR, XOR, THEN, THEN IF, BUT IF etc. Very useful when you really start getting stuck into you specific use cases.
If there is anything in particular you want your automation to achieve, describe it on here or on the CoRE peer support thread and lots of people will be fighting to give you solutions.... This is a great community!!