I'll chime in here, since there's a lot of assumptions being made.

Our data shows Quinn dropped 1% in Avg MMR and 0.5% in Skilled MMR. This puts her at ~49.5 and ~52 depending on your parameters.

Yes, Quinn is weaker if she builds Shieldbow. To be a bit blunt, that was the point of nerfing Shieldbow. Shieldbow champs were outperforming other champs.

Should Quinn be compensated because she lies between 50-52%? It's not a clear yes/no. However, she's in our mind a very viable-strong champion in the expected patch. On the other hand, champions that fall below 47/48% are usually notably weak. The champions that usually sit here without being buffed are notorious Pro Play champions (which is a while different discussion), like Azir, Aphelios, Ryze, and until recently Akali.

I agree, Quinn is a niche champion with a lower playrate than Yasuo and Yone. However, it's a very complex discussion to say that niche champions "deserve" to sit at higher winrates and I won't give a definitive answer since it varies for champions and situations. A champion being 52-54% doesn't necessarily make the champion more popular (see Asol). A niche champion being strong may not also be good for the game (imagine tryndamere being 54%). Sometimes even niche champions don't even necessarily have hard skill curves, so the assertion that "only mains are propping up the winrate" might not even be true.

Anyways, this is something we are looking at examining even better, since clearly there's some areas where we're missing what players feel are strong or what we feel are weak. We're not perfect, but we're working to get there.

Personally, I think there's a fair argument to say Shieldbow could have been nerfed much sooner to avoid hitting champs and this sentiment of "riot special", even if it was correct per the data.

But more specifically, it was not just Quinn. Quinn's nerf was because her dominant build and role exceeded our winrate threshold with a large enough playrate (>54%). Basically, this is our metric saying, if this champ is in your game, its likely unfair.

We also nerfed many other shieldbow-dominant champs, Graves, Viego, Irelia, Aphelios Ashe, Varus are few that have had Shieldbow as their best item.

Morde jungle is great. I'm having a blast playing him.

Nocturne and Senna both :)

Many of us pushed very hard for stripping several of the potential Senna buffs. That said, players really do like playing her as crit, so getting her builds closer in power level is definitely important.

Conqueror was already better on Nocturne. People are just still choosing to build incorrectly.

Idk I explicitly Nocturne one-tricked the back half of 2021 and Conqueror seemed to always be higher any time I checked. Eh whatever.

Kraken has been her most popular build for at least the last eight months. It’s never been her strongest.

She is overall unsuccessful and preseason ended up nerfing her. Just because an unpopular strong build exists doesn’t mean the champion can’t be buffed. At least I think it’s reasonable to approach the game that way.