> Overloadable operators are not an instance of hidden control flow.

In general perhaps not, but in Zig it definitely does. Zig considers calling a function to change control flow, because it's no longer just an operator but something that can cause side effects, includinh mutating in place. Perhaps control flow isn't the right term, maybe non-trivial would be better?

With regard to wrappers, I personally find them ugly since 1. They bring in indirection, and I have a personal vendetta against unnecessary indirection, 2. Wrapping doesn't compose well and is a pain to shephard between representations, 3. It's harder to make a function generic across different representations, and 4. Wrappers often don't re-export everything available to their underlying value.