HEY, I got Weird Idea for Crit

What if we turned Critical Chance into something else. what If it were not a RN-Jesus System, but a linear one

my idea: Focus

yes like Ashe's old passive, you reach 100 stacks you Crit, but different.

It would function similarly to energise but fade off out of combat

but with just basic attacks.

for example

lets say, has 1.00 attack speed, an and a which have 8 & 12 focus respectively, for a total of 20 focus.

now, basic attacks another champion, gaining 20 stacks of focus, he attacks 4 more times for a total of 100 stacks, and then he makes a sixth attack which crits. (if he were to use light-slinger, I suppose the extra attack wouldn't stack or Crit.) starts farming again and attacks a minion, gaining 5* focus stacks (a 25% effect for Minions and monsters, large and epic monsters excluded).

now Lucian with 80 stacks, recalls because he has gold, by the time he gets back to the platform, all his stacks have decayed, because after 5 of not taking or dealing damage, he loses 25%, losing an additional 5% for every second out of combat.

I know its Weird, but tell me what you think?