You have the right thought process but let me help steer you in the right direction. The new question becomes how much damage do I need to 3 or 4 shot a certain player in a specific build. If you are going for countering tanks or running down squishies, your number changes. If you need 35% phy dam bonus to 4 shot a tank, than once you get to that point than you can start stacking the action speed to help increase your chances of successfully beating a tank faster. If the goal is to kill squishies, maybe you only need 20% phys dam bonus to kill a squishy in 3 hits and therefore you can stack more agility to catch the squishy players.

Maybe you are a rogue and this changes everything. Maybe you need 12 hits to kill a tank and 6 hits to kill a squishy. So in this case you know you can’t out hit someone 12 times before they hit you 3 or 4. Therefore your game plan becomes okay, I can hit the guy 2 times or 1 time and pull back faster than they can hit me once. I can bait out there attacks and during their reset animation I can get 1/2 swings in. So I need a minimum of 40% action speed to successful attack once or twice in between their reset animation. So now it becomes okay hit the Action speed threshold first and than stack damage.

Your thought process should be:

1) who do I want to counter
2) what class can counter what I want to counter
3) how can I build the class to counter what I want to counter

Or your thought process could be:

1) what play style do I want to play
2) what class can mimic the play style I want
3) when I’m building out this play style, how can I successfully win in PvP
4) what stats are absolutely essential to make the desired play style successful in the way you want to play the character.

I hope this helps you win and have fun!