I-M
Unless requirements have changed there used to be one that said if you abandoned the controls in a steady heading sideslip the aircraft had to tend to level its wings and not just sit there banked. I have worked on light aircraft programmes where it was necessary to add the interconnect of which you speak in order to achieve this.
I have no knowledge of the Grob.
It is no huge deal but I am not sure I like it added solely for this reason – just like you I surmise.
JF