Curiosity calls

Ok I'm nothing special in league, I'm not saying I'm pro or anything, in fact I will say I'm around silver 2-gold 4 in skill, nothing impressive or good but I have a question to the countless Yi, Pantheon and Teemo mains, why? what makes these champions stand out for you? why do you play them? Now before you say anything I'm going to say why I like Victor, Elise and others like them, I love mechanically based champions where to be good you have to know what to do and when to do it, not roll your face on keyboard and win (that's how I feel when I play the before mentioned champions) so when I lose with a champion in lane I learn what I did wrong like "I should have threw that Stasis Field on me knowing Xin would jump to me" or "I should have Q'd a minion so I can run faster" also when I win with that champ I feel great because I used everything I learned to win, all that work to mechanically get good with that champion pays off and now you get kills that you feel you deserve, well that's what it feels to me, as if I play Yi I don't get that satisfaction, this is how I feel when I play Yi "I Q'd and gave autos" I guess that's why I'm not an ADC main because when the champ does the work for you its not fun to me, but hey maybe one of you guys can clear this up. what makes these champions so fun to some people? Am I missing some secret to playing them and having fun? or is it just some people enjoy the simple mechanics? Please answer for I really do like to know