A lot of the designs we use today came out of the golden days of archery in America in the 1940, maybe before. A stiff handle bow has more mass, most were longer and set up for target and hunting. When the TBB series came out lots of earlier those norms were edited by folks that tested every bow style and bow wood, experimented with both and changed the rules. Even when TBBIV came out it corrected methods that were cut in stone just a few years before in the earlier editions. Folks are doing things with wood bowyery today that I couldn't have imagined 10 years ago. All of this is good. It shows that archery lives, is alive.
A well made bendy handle bow shouldn't have hand shock. Most hand shock probably comes from poor design and execution.