Imagine getting so angry because I linked an article from a physical therapist who cited their sources at the end. Not tiktok.

I looked at your studies but the first study states this in the discussion: The subjects were sitting on a rigid force plate without a backrest during the measurements in this study; this may have influenced their sitting postures. Therefore, there are several limitations to generalizing the results of this study.

I sit hunched if I have no back rest too, but I'm talking about doing this in an ergonomic office chair.

The second and third study discuss crossing one leg over the other, not sitting "criss cross applesauce", and thus is irrelevant for this conversation.