You simply going "Nononono" and spouting an example that doesn't reflect reality gets you nothing.
You've had multiple Tanking experts and people VERY familiar with how the Res, Def, DDR, etc systems ACTUALLY WORK tell you you're wrong.
Unless you can provide definitive mathematic proof that proves Arcanaville's formulas, which have held true for basically A DECADE OR MORE IN-GAME (the same Arcanaville who Paragon hired to go over their power and balance equations), you're convincing nobody.
And before beginning your exercise, please read this AGAIN. https://archive.paragonwiki.com/wiki/Soft_Cap