Well can you show Spicious an example of it anyway? There'd be a lot of hair that could remain on max newbies heads if it can be cut from the max requirements.
I suspect all it is is that the children inherit their parents rotation and scale, and resetting x-form simply resets those matricies to 0. So, if you have a turret base with rotation relative to the hull being 0,80,0 and then a barrel whos rotation relative to the base is 0,90,0, then the barrels rotation relative to the hull is 0,170,0.
When when the base is reset, the barrels rotation will be 0,90,0 relative to the hull, which is obviously quite different to 0,170,0.
This
is still just a guess though.
