Champion identities and Build paths

Here's the main just of things.

I honestly think that champions should have a role they play on a team, and most champions do so. My problem lies when I get a in my ranked game who builds full AD and when 5 people, with an ADC, can't kill him. This is a problem

Why do i think this is annoying or out of place? League of legends is a competitive game with a casual base at heart. I am fine with people building full ad . That's not my problem. The problem lies when the champ has built in tank so he can go full AD and still be tanky. There needs to be a line of "this person is squishy and full damage" or "This person is full tank but deals no damage". I am fine with the mid ground, the if you will. deals tons of damage, but can't take a whole lot because he either does 1000 damage and dies after 2 seconds, or deals 10 damage and dies after 2 hours. that is a good balance. he is tanky naturally but in order to deal damage he has to build damage based items. Where lies is that "Bull****" stage. I rarely have fun playing against a , because he builds black cleaver and just doesn't care about anyone else and just nukes someone. That is (in my opinion) unhealthy. Bruisers are meant to deal tons of damage if they get to you. But has MOVEMENT SPEED ENHANCERS WOOOOO. So that's not a problem is it? if you cant tell, I'm annoyed. continuing on. Having flat damage reduction on a tank isn't a terrible idea. Whats a terrible idea is on the same champion, give them a decent AD scaling on both his E and Q. Woopty doo. Looks like we have some text book Bull**** right there. I'm not going to touch on his silence because in my opinion silence is the most annoying thing ever. specially on an AD when he jumps on your butt and does 1000 damage in 3 spins. yeah, I was tank naut with 2 armor items plus my shield and that still did 1000 damage. WTF. Noone likes that. and hey, when i tried to turn back, his w stopped most of my damage which on a normal adc was 800 total combo damage with ult. i did 350 i think. something like that, i didnt do the math. I was to salty at this point. Im still salty hours later.

my Point is (or TL;DR) What needs to happen is make an off build for a champion less viable. Because AD Is Bull****. thank you for your time. please, change garen. hes no fun to play as or against rn.