I'm glad you've not had any problems and never seen any accidents. I haven't had any accidents either, and have used a corded plug battery since the 50s with no accidents. That was until I saw the first "remote" ones. And my first electric starter was a corded one. But now I use no cords and there is no possibility of hooking a cord at all. I've also never stuck my hand in a prop when adjusting a needle valve located at the carb, but see the value of the remote needle valve locations that some engines come with today. And buy that configuration when available.

I have seen cords in the prop a couple of times. One was done by a very experienced modeler on his last flight of the day. He was practicing and planned to pack up after two more flights. I guess he just got careless. And wound up putting in no more practice flights that evening. And wound up destroying a beautifully painted prop and cracking a Nats winning paint job it'd taken him weeks to apply. Which is why it's better to remove risks that can be removed. And in this case, removing the cords gives a couple of real advantages as well as completely removing the risks.