Recorded tests break because they remember where something was, not what it was. Change a wrapper div and every selector below it snaps.
Relocating by meaning
QAce finds elements the way a person does: by role, by visible text, by relationship to nearby landmarks. When markup shifts, the button labelled "Continue" inside the checkout step is still the button labelled "Continue" inside the checkout step.
Why a calibrated judge beats a coin flip
An agent that decides pass or fail on a single look is a coin flip with extra steps. QAce separates observation from judgement: it gathers evidence, then a separate judge weighs it against the stated intent of the test.
That separation is what makes it safe to gate a pull request. A flaky verdict that blocks a merge is worse than no test at all.