I can answer that because I just drove home in the rain at night in my Tesla Model 3.
It was a light rain that has been falling for hours. The roads are sleek but very few deep puddles. No problem with traction, but the sheen of the water combined with poor lane markings means it’s often hard to see the lanes.
My experience has always been the vision AI can discern lines and road markings significantly better than I can. So I often choose to drive with autopilot on and keep close attention at night in the rain.
The car will be almost always perfectly in lane while I am freed up to pay more attention to the greater surroundings, traffic signs and lights, route planning, and watching for hazards and other traffic.
I find at night in the dark driving without autopilot, lane keeping requires significant focus, which can mean other driving tasks like route planning and identifying hazards can suffer.
As of right now, exceedingly few cars are being driven entirely automated. Humans using autopilot will have more time and focus to identify and avoid cyclists/pedestrians that are on or entering the road. Autopilot is a massively useful safety tool.
Unfortunately some humans abuse their driving privilege. Drunk driving and distracted driving are huge and growing killers. Human drivers that are supposed to be paying attention that instead hit a cyclist / pedestrian are at fault. If it’s done while driving distracted on autopilot that’s even more so the human’s fault.