You say that, but don’t forget - An aircraft is a small, small thing, flying through a big, big, sky, in a mostly straight line. Autopilot works so well, because there’s a hell of a lot less than can go odd when all is situation normal. You miscalculate by a bit, you’re still just in the empty sky(well, hopefully it’s really bad if you’re not.) Any situation even a little out of that - heavy turbulence, takeoff, landing, it’s all pilots, it’s not just emergency situations, it’s anything more technical than pointing the nose at something far away and making it not be far away. The reason Autopilot works so well is because there’s literally fuck all happening that they need to do - long, straight lines, easy curves with nothing to run into.
Pilots are also trained not to trust the Autopilot entirely, to monitor it, to make sure. Multiple crashes have been caused by pilots putting too much trust in Autopilot systems. The pilot isn’t there to take over when the Autopilot can’t. The Autopilot is there to save the pilot from doing all the boring, tedious, and exhausting bits in the middle that could practically be handled by tying the stick in place with a bit of string.