It is a double edge sword that does not need to exist. You can have a freeform action resolution for any class ability (martial or casters) and still provide detailed abilities. Overall casters are just as simple, but they have something to look forward to when expanding ability.
True. Unfortunately D&D history has not been kind to such things. Tradition limits possibilities which would be widely accepted. 5th edition design further limits options. And the mistakes and errors of the past arrest design. A history of screw ups hinders retries.
As an Elemental excerpt, I didn't expect much for noncasters. But they are probably strong in those the Mass Combat UA due to the scaling.