When in my early twenties, I walked into Hugh Rich's shop and picked up a Howard Hill Longbow, and asked if I could shoot it, he said, sure go ahead. After awhile he told me to get a hold of the bow, and keep the bowhand and release still upon release. I believe he was instructing me to heal the bow. Anyway, I listened, as he was willing to help and I knew he was good friends with Howard, and I figured he must know something about shooting a longbow.
Soon after that, I bought a 69", Hill longbow that was 72#, and shot it for a long time, and still have the bow. What I learned later from John Schulz, really helped and convinced me, that form matters.
If your interested in shooting one, read his book, or watch his video/DVD, or talk with one of several people that learned from Howard or John. I am sure there are others that learned it early, and some like my self that took awhile.
Yes, it is possible to get a poorly designed longbow, or recurve for that matter, but I would bet, getting some one-on-one instruction, or help would make a world of difference, if you don't have it down, and would like too.
No Ole Thumpers welcome here.