While I can't speak for anyone other than myself, I think about champion design and discuss the issue because I think it does matter. Because the more that women are treated as purely objects of sexual desire, even those that exist only in imagination, the more we end up creating and/or tacitly supporting (even if only accidentally) people who think it's acceptable in the real world to treat real women as purely objects of sexual desire.

Misogynistic behavior does not magically happen - it is taught, and then it is reinforced by the culture we create.

a) feminists are people (men and women) who believe women should be treated equally to men
they are not whiny *****es that hate boobs and ***

b) no ones complaining about the fact that the female human champs have boobs (except the ones that dont really need them other than to be sexualized)
like i dont care if nami has boobs
i care that they designed her frill and skin tone(s) to imply that she has human breasts (making it look like a "naked" skin tone, and making the frill look like a v-neck blouse revealing her cleavage) when the rest of her is clearly just a humanoid mermaid (humanoid =/= half-human)
i think they should have left her chest bare and green with lady lumps, but not imply she has something to hide (nips) like they did now
or go full hog and make all of her top half human..

c) feminists dont want them to stop making sexy champs
we like boobs too
we just want to see other body types and age groups AS WELL AS sexy champs
we just dont want to see the vast majority of female human champs be oversexualized while the male champs get all sorts of good stuff and wait for bones to be thrown to us so the "scary feminazis" can go away.
(ohh but you get leona and riven and varus)
good! but thats what, a few examples compared to the dozens men get?

i dont care if you're "90%" of the players (which i also think is a damn lie)
i dont care if you fap to the champions (go to rule 34 for that)
everyone should agree that seeing sexy champ after sexy champ (whether or not their character calls for it) is boring, unoriginal, repetitive, and since they dont make just as many sexy males, its sexist.