Use it as a drafting assistant, not an autopilot. Google's automatically-created assets can generate serviceable headline variants. But they optimize for what Google's models predict will get clicks, which is not always what wins you profitable customers, and they occasionally produce claims your business shouldn't make.
The workable middle: write your own core headlines (your offer, your differentiator, your geography. The things only you know), let AI suggest fill-in variants, and review everything that goes live. Never enable auto-generated assets you haven't read.
Whatever writes the words, the accountability doesn't move: it's your business name on the ad and your policy record if a generated claim crosses a line.