What generative creative tools actually changed for testing

The genuine change generative tools brought to ad and email creative is production speed — a first draft of a headline or image variant that used to take hours now takes minutes, meaningfully increasing how many variants can be tested within the same budget window.

That speed doesn't tell you which variant is worth testing in the first place. A hypothesis about what will actually move a specific audience at a specific funnel stage is still the scarce input, and generation speed without that hypothesis just produces more untested noise faster.

The practical use case we see working best: use generation speed to test message and format variation within a strategy the growth engine has already set, not as a substitute for having a strategy.