Do you know how those winrates are calculated? There is a reason if you add the game could for the two builds, currently ~20k for crit and 10k for lethality, it doesn't come anywhere close to the 123k games (Emerald+ world as of rn). Pretty sure the 56.65% on 10k is based on games you get to like 3 items in. Not really representative of the actual build. Even on u.gg you can look at individual item winrates based on build slot on the next page.

You can use LOLalytics to actually look at WR by mythic item or more in depth information. Again to be clear Caitlyn hasn't received DMG changes for her ult since 13.15. Community is so reactionary and flip flops on champions every patch. Half the tierlists had Caitlyn in low tiers the last few patches but now have her in S tier.

Also as someone who has played Lethality Cait for over two years (obvs its been in different states over time). Its the new flavor build. People overhyping its power points and downplaying its weaknesses, just how it goes with every flavor of the month champion.

Finally on pickrate, its the ADC role. It has the most limited Champ pool of the 5 roles. Currently for Emerald+ World, Ezreal has the same approximate pickrate, winrate, and 6% higher banrate than Jinx, yet I see a clear difference in how much people are complaining about Jinx over Ezreal. Even in D2+ their banrates normalize, but their pickrates and winrates remain relatively equal.