This dismissal of honest performance benchmarks is why I'm glad you're not leading Godot. We're not talking about some esoteric cloth simulation code being nitpicked. These are core architectures issues costing you 2x performance minimum, simply due to how the c++ and C#/GDSctipt/GDExtension layers talk.
Take this as a warning, not a dismissal. Unity went down this exact path and we see how viable it became for large scale game development. I sympathize with you for those who are outright trashing the GDScript for being a scipting language, and I do wish those arguments would die down (it's simply language wars). But there are definitely fixes here that would improve all diferent bindings, even if they never diverged (which IMO, they should).
>This is like showing up for dinner and insulting cooking before you’ve even tasted the meal
cooking is subjective (mostly), performance is not. This is more like asking why the cook is trying to carefully drain out the water with a loose lid instead of using a strainer. Sure, it may work for the cook and they've done it all this time, but I'd rather give a safer solution that won't burn them long term, or spill out excess food.