What sensationalist comments are you talking about? I was quoting RB34, not you. And while I won’t question the fact that you’re saying you never trained above 75%, I have personally never met a single lifter, and I have met hundreds, that squat over 500 without ever training heavier than 400. Neither have I ever met any 500+ squatters, and I know dozens, who never train above 85%, much less never train above 75%.
If that’s you, and I’m not actually questioning it, you are the exception, not the rule, and certainly no basis for forming a training philosophy for max strength development.