I believe a warbow proportioned yew selfbow is a special bow for certain people. Yew is high performance, no doubt, but it is also high maintenance. It is a soft wood, requires knowledable tillering, and needs to be cared for with great attention. Not a good bow for first time or inexperienced archers. Also, they're expensive... to both make, and purchase. Owning a yew selfbow is the refinement of an archer's status as such. Like a car enthusiast owning a vintage MG. it requires knowledge and care. From experience, yew will not lose any performance, but would not make a good knock-around everyday shooter. Also, if Medieval bowyers could have gotten their hands on osage, don't you think they'd have used it, with great success? Especially with a hickory back? Yew was the best material they had at the time, for heavy weight warbows. A yew selfbow is a truly amazing piece of our living history... well worth experiencing.
Cheers.