For me it was stubbornness and stupidity not to change technique and try something else. So the jounger you are and the earlier you start to adapt and Chang e with fish demand the better you become. For me I was slow in changing and excepting new ways. Now I am open for change and new challenges within each technique, this could be easy to a steep learning curve and that has to do with each individual needs and perception and willingness to adapt and improve.