Master Yi changes
Let me start off with saying this is not a QQ thread. I just think Master Yi can lose some things on his kit and gain something else instead. His Q can lose the crit chance since it is really buggy and not really strong either. His W could lose the AP scaling since he rarely builds any but instead heal a flat mount and probably give him more resistance. Finally I think the reset on his Ult passive can go and instead give him something to be a true wuju master.
taught a monkey the stlye of WuJu and look at him now
When Master Yi Ults his status as master should be known to all. Maybe with a passive like if you have above X attack speed gain Yi's passive for his ult duration. If X attack but below X attack speed %X of attack deals additional true damage. If armor is greater than yi resit X amount of damage.
These are all things that Yi can do so he is teaching his allies to do it. Yi might be an assassin but other assiassin's can still team fight or have better escapes. Some more numbers might need to be tweaked but just an idea.
for that and he slows AA too).
. But seriously Squishy champion get punished more by cc than a tank you one. Since Yi builds almost all attack stats he gets punished hard by any format of cc besides slows if he is ulting