Trinity Force is like 6% win rate above any crit item in the game.
Where do you see that?
At least the data we have available from third party sites like lolalytics.com suggests that shieldbow performs well on her, too. See e.g. https://i.imgur.com/5VIrzhr.png
And that's still skewed towards Trinity Force since there's a selection bias towards less knowledgable players among the players playing crit builds on her right now.
Wouldn't Essence Reaver + Shieldbow have similar synergies on her as Trinity Force? Especially now that her ult on-hit damage can also crit?
Edit: It's obviously a low sample size but Shieldbow + ER (and vice versa) currently sit at 57.74% and 58.31% WR according to lolalytics.com, not far off from Trinity Force's ~59% two-item WRs. It also makes sense that her builds would favo...