The safest ad carry shouldn't also has the most AA range
adcs scale with items. so its really meaningless to discuss how much damage they do. its the safety and utility of the adc that makes them strong or weak.
right now the top two ad carries are mf and ezreal. but that doesn't change the fact that ad carries are balanced around themselves and not with respect to other champions. tristana and twitch just few patches ago were the top two without any nerfs to them they dropped to probably 3-4 why? again. because mf and ezreal are plainly busted
tristana right now if she gets a small lead in lane you cannot tell your lane to just survive because they won't. shes too good at pushing her lead and she has too many safety valves to survive. those are 3 things. her massive range. her R and her W are two seperate way to disengage.
to put it quite simply what my idea is. she should be losing one of her two ways to get people off her. its too much. shes a hypercarry. getting on top of her should be encouraged. right now you jsut hope she gets hit by some massive AOE and insta dies mid late game or whenever shes fed because its practically hopeless for any short ranged or melee champion to do anything to her.
if shes gonna have the two disengages. remove the passive and insert a new one.