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This is a thing! For example, https://arxiv.org/abs/2511.06516

that's brilliant, I wonder why we haven't seen much use of it to do very heavy quantization

This is a very well established idea. It's called dynamic quantization. Vary the quantization bit-width (or skip quantization altogether) on a layer by layer basis, using a calibration dataset.

EvoPress is the first time that comes to my mind, when I think of dynamic quantization.

https://arxiv.org/abs/2410.14649

I've experimented with this with diffusion models with a safetensors - gguf tool I wrote. even with relatively few sample images (~10k, still enough to keep my 3090 spinning for days straight) the benefits are quite noticeable - a smaller file with overall better results.