Imagine this scenario where you're required to move one of the component in that Rigid Group, it'll be a nightmare and time waster since we need to dig through the browser tree and then deselect the component/s we wanted to move, and after the move is done to reselect and place them back into the rigid group.
So instead of doing all that, this will just add a toggle button where the user use the move tool to ignore any components constrained in a rigid group and it'll update the component position in the rigid group once the move operation is completed.