Improving Yasuo's readability in-regards to Q stacks would go far in reducing player frustration
Creating a very easy to see indicator for Yasuo's stack level would go very far in lowering player frustration against him.
Currently Yasuo's knock up works as following: Q1>four secs> Q2>4 secs>Q3 knock up
Many people are often caught off guard when he already has his first stack, since there is no clear way to see when Yasuo has already built up his first Q.
A yasuo with no stacks is 8 seconds away from being able to knock up. A Yasuo with 1 stack is only 4. It makes a big difference.
Also, In regards to the 2nd and 3rd stack indicatiors:
Players often have to squint to see the thin air effect indicator around him as he dashes about and the little sound queue can easily get lost in the midst of everything else happening. These should be improved for readability as well.