Why Featherine and top-tier Reality Warpers are still physical and beatable and why Saitama is likely the strongest. Please prove me wrong, I like arguments

The reason Saitama is the strongest character in fiction comes down to a fundamental rule of physics: all hax and reality-warping abilities must eventually manifest as a physical change to affect a target. When a reality-warper like Featherine rewrites a script, or when Sukuna uses a World-Cutting Slash, the final result is always a physical interaction with reality—such as moving atoms, shifting gravity, or tearing space. Because reality itself is inherently physical, these godly powers are ultimately just complex forms of physical force. Saitama’s narrative rule is that his body possesses boundless physical durability, and he has already shown the ability to treat non-physical concepts (like hyperspace portals and spiritual dimensions) as tangible objects he can touch and break. Therefore, when a cosmic entity attempts to warp reality around him, Saitama’s boundless physical nature simply overrides the attack; he can literally punch through their reality-warping energy or speed-blitz them before their physical minds can even process the thought to rewrite the plot.