Your arguments are comprised of a child's "IM RIGHT AND YOU ARE WRONG! SO THERE!" please give actual points and evidence to prove your points or shut up. PLEASE!
Actual evidence would be formulated along the lines of
Sivir has the best wave clear out of all adc's, however, she also has the shortest range and least ways to do damage. Majority of the other adcs have a damaging ult, even if it is to cc people(looking at you
). 3 adc champs do not have a damaging ult. Urgot(his is meant to place an enemy into your team, so that is utility into damage) Kindred(but they are meant to be in the jungle, so do they even count?) and Sivir (group wide ms boost). Lets look at the kits of these three, shall we?
Urgot: Passive decreases damage dealt by the enemy hit. Two damaging spells, one that makes the other lock on and can not miss, and a shield that makes his auto attacks slow.
Kindred: Passive gives free damage on auto attacks, but depends on killing jungle camps or enemy champs. 3 spells that do damage. One is a dash, one acts like independant auto attack with 1/2 damage, and a slow that does % max health after 3 hits.
Sivir: Passive gives small ms boost after attacking. 2 spells that do damage. 1st is a pass through skill shot with low damage that further decreases with each target hit. 2ed is a auto attack modifier that allows her aa's to bounce for 60-80% damage(and the bounces do not apply on hit effects, nor can they hit the same target twice), and a shield that only blocks one ability.
Sivir has the least useful kit in a fight, so her kit is more suited to split push, what with her spell shield and ult for getting away. And what do you need to split push? WAVE CLEAR. That is her niche. And because it is the thing she excels at, at the cost of ableness in other areas(like range or damage) she cannot this aspect of her kit nerfed so that it is more in line with the other adc's, because then she would have no reason to be picked. And as Riot is trying to give each champ a niche, the chances of them taking away a champions when there isn't another that conflicts with theirs(like how Lux, Xerath, and Ziggs were too similar, so they were changed to be different) is nil.