Comment by liuliu

They ship a complete checkpoint for easily management (inference & training) in their own infrastructure. Moving to a LUT would make training on these layers impossible. BTW, these are not useful for lightweight fine-tuning, but might still be useful if you do serious post-training work.

Of course, these are also not an issue for things like FLUX.2 which adopts DiT-Air arch, that doesn't have this wasted space issue.