As you get more high performance, away from pistons, you get big massive propellers that can move a lot of air and move the airplane faster. It's a double-edged sword. It means when you have an engine failure, if it doesn't feather, it affects control significantly more, as in having a great big drag source. These will slow down fast, compounded by not pushing the nose down. Keeping one of these in a climb attitude and with an unfeathered failed engine is going to likely Vmc roll it every time. It's on the before takeoff checklist to feather the engines on the ground and bring them out with the manual feather to make sure this is possible in the air and the first cockpit item besides control for an engine failure is to verify that it's feathered and manually feather if it hasn't. You can't screw around with that in these planes, they slow down quickly. It's rare for the autofeather to fail, but it has happened.