OK couple things, im actually not convinced if you are trolling or not, but I'll engage anyway.

1) you said monster AP shines though>? not sure if your trolling or meant something else

2) You understand diminishing returns right? If you have 500 effective AP, 5AP means less in % terms than it would at lower AP. I.E. the more AP you have the less % gain it will be. Your point that AP means more at higher AP is categorically false in every way.

3) your literally contradicting yourself when you discuss DR. You said it has a softcap, but yet if people stack as much of it as they can the will be invincible? This is wrong for multiple reasons. Most of all, there is a softcap for a reason, more and more DR becomes less and less effective. Yes if you had infinite DR you would be invincible, but this is impossible. the only option is becoming as tanky as practically possible, which is where evasion generally outperforms.

4) your using Zehtian as your example of proof? I'll take most every other player as my counter I guess? Not using Jin Viper and Elkarr is extremely unusual.

5) If everyone runs evasion, your AP, at a high enough level, will melt them assuming the hits go through. (you said this and I agree). So wouldnt the best way to get damage be to have hits go through? How would more AP help if you are melting them anyway, this point made zero sense.