Curiosity question: are female characters made intentionally uglier over the years?

I play this game since release. The earlier characters were Katarina, Leblanc, Miss Fortune, Caytlin, Nidalee, Ahri etc. Then, in more recent times we had Reksai, Illaoi, Taliah, Camille, Yummi. Of course character design preference is subjective, but you can clearly see that the oldest one were more "attractive". My question is: why? I am just curious.
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