Generally,on Selfbows,the wrap makes for a better grip,but i have seen severall people,who dont use one.The strike plate area though,its better to have something,to dampen noise.
On a side question, how many people here have hunted deer or anything really with a d-bow?
The First deer i ever shot,back thirty some years ago,was with a D bow my Grandad made.Actually,im headin back to the simplicity of the D bow,these days.