It's an interesting point you make but when I chose my first instructor I rejected the shirt and tie guys because I thought they were intimidating and just interested in putting me though a sausage machine. I (like most PPL students) was learning for fun - I had no interest in becoming an airline pilot or being taught by someone who wanted to be one or wanted to pretend that he was teaching me to be one. I chose people who seemed to have a passion for aircraft and flying and teaching - and none of those were kitted out with ties ! My views haven't changed much over many years of learning and teaching. I'm not saying that instructors with ties are no good - just that it seems a totally impractical get-up for working with light aircraft.