In a similar vein I find it interesting when you really love a champions mechanics and abilities and feel, you feel they will be a good fit for you, and you are terrible on them. Then you play a champion you have not given much thought toward and end up great on them. SOMETIMES I can re-visit them and understand them more fully and play them with a fresh play. That might also be a good idea for anyone arguing either side of this.
As far as playing certain champions and chastising people. I can understand you really should be logging into ranked with a few alternative picks, not a one trick, what if they are picked or banned? And you should be playing your A game... ?
On the flip side of this coin people can want to play a specific champion for reasons others may never understand. As an example, I am VERY much so a 'memory and interaction by association' person, you change your messenger icon, I will be a little off by it, I may not reply to you right away even if you say hi and I see its you, its like my brain resets, I act 'new' around you. They change a skin or effects on a champion drastically or the abilities dont LOOK like they FEEL and I will struggle to play the champion. For me its like trying to play a dancing game with the sound off. You come at me with a champion in a new skin and even if I read the name 10 times I will have to keep reminding myself. Like these God Fist and god skins throw me. Its just a weird example of why someone might keep picking a champ they are not amazing on.
although to go back and forth there are like 150+ champions and a 1 trick should really ask WHY they 1 trick, what it is they like and dont like and ask why, what they tend to be good at weather its what they want or not, and why, or why they are bad on who they like and AT LEAST consider other champions or they have no business in ranked. Thats 100% why there is a minimum champions owned to play ranked. So you have alternate picks.....
Picking 1-2 champions only is selfish. Does the team need AP or AD? Do we need more DPS or TANK? And what if you pick is banned or taken or you dont get the role you want? You are supposed to pick and build items in response to the enemy team. If you dont thats fine, you wont move up, but if you are playing ranked casually, without caring if you win or lose or how you perform, you are only ruining games for others and should not be in ranked. If you want to play purely for fun and dont care, then play normals.
BY THE WAY before the report descriptions changed from stuff like 'unsportsmanlike conduct' Riot FLAT out said not playing your role, or not playing the game in earnest to win, was reportable. Thats the game developers feeling on it. Meaning your attitude could be seen as negative or trolling, esp in ranked.
So you never know. Stuff like Kat's rework , I still cant play her correctly now.