I don't think kiln drying or force drying hurts wood at all I do it all the time and have for years. I was never a believer in seasoning until very recently when I started pulling old seasoned bows out of stock for reevaluation and a little rework. I really don't notice any difference on the white woods as much as I do osage and yew but I don't have very many white wood bows I have kept all that long to compare. A well seasoned bow seems to have a lot of the characteristics a heat treated bow has. I know its not all about moisture, my wood stablizes at about 8% where I am at.