Bionicle "Minifig" parts

[Magnus Forsberg]

Then I would argue that the droid/cyborg/mechanical/skeleton parts should be changed to Figure as well since none of those use the Minifig torso/legs

All of those live in the same "minifig universe", but I don't see that the Bionicle figures do.
But maybe they do? In a different world. Many of the sets with these figures use regular lego system bricks.

I wouldn't object if they ended up in the minifg category.