Using you an example, with a TD that plays more like a heavy, you average less than 1 enemy spotted every 2 battles, less than 3 hits per battle and barely kill 1 tank per battle. I don't think muddy is overly concerned about useless TDs hiding in the back unable to even see their targets, let alone shoot them.
When did i ever say a TD that plays more like a heavy? yet a TD can sit in the back fire do damage and not be seen just like arty. yet TDs are not as blind as you make them sound. So your wrong.