My first plane, RTF trainer, did not include the neck strap. So I learned to fly using thumbs. I also tended to overcorrect a lot using my thumbs on the sticks. My Futaba 6XAS came with the neck strap. I started using that and love it. I now tend to pinch the sticks, which makes it a little more difficult FOR ME to overcorrect.

I am not trying to start the old Which is the best way to hold the sticks? argument. Just saying what I do and why.