Quinn's animations are slow
I know this can be unpopular due to the fact that she is not really underperforming in terms of stats but I realised that while Quinn doesn't have any glaring lacking in burst or sustained damage, she falls dramatically behind any other assassin in terms of combo execution time. Most assassins can blink in, burst and blink out in the same time that she needs to just land her E (which does not protect her from skillshots and aoe either while being interruptible). I know she's ranged and I'm mostly comparing her to melee champions but I don't think she's any safer than any of them, with the nerfs to the ranged toplane meta she's going to lose her place in the game.