Sure, your no code system can be Turing complete. Lots of things are accidentally Turing complete. But at that point, aren't you just coding with a different interface but all the same problems and complexity? And (as argued already elsewhere in the thread) none of the tools and support...

I agree that "arbitrary business process" is a smaller target. But it's one that grows over time (see GP comment) to include more and more "solved problems" that were solved by lots and lots of code.