Master YI untargetability is huge problem

Master Yi untargetability last around half a second or less then 1 second based on amount of enemies Alpha Strike hits. But during Final Hour Vayne has 1 second invisibility aka she is completely untargetable for Master Yi

Yi may use Meditate for damage reduction and healing but Vayne has Hard CC and even if she doesn't use it she got true damage which makes Yi's Mediate completely useless against her. He is just sitting there and taking it without being able to reduce the incoming damage or heal at all aka negative healing during meditate

In case Yi engages on Vayne she can go stealth for entire 1 second then she comes out of stealth and hard CC Yi into a wall for for 1.5 seconds dealing up to 370 (+ 100% bonus AD) phys damage. After that Vayne Thumble is off cooldown and now Vayne can go for another 1 second invincibility which again makes vayne completely untargetable for Yi

You may get a "detection" tool it feels like detection tool with massive lag cause it has 0.3 - 0.5 second refresh rate on enemy stealth units which can bring more confusion than being any help at all and that wont help at all cause Vayne can still hard CC you into a wall while you are not being able to touch her during her invisibility

Also while Yi being placed at his initial target or at his own initial position based on if target is alive or dies during alpha strike, Vayne can move around and position herself during stealth freely so it's hard to tell where she will reappear next

At the end Vayne can win a fight against with high chance for not being touched by Yi at all going for total of 2 seconds untargetability (invisibility) and hard CC Yi for 1.5 seconds while Yi's untargetability < 1 second