I can only say that however useful they may be they are not useful to the average Grade 2 player - well, certainly not any of mine. After we have battled with scales hands together for the first time, new keys and two octave arpeggios also for the first time, I turn the page in the scale book and present them with what they see as four more lines to learn and that is really too much. OK, I know the fingering pattern is the same for both examples but that is the point when most of mine say that G2 is much too difficult.
Do broken chords in any form to your heart's content but let's get them out of the G2 syllabus. Actually i don't really want to see them in any exam syllabus. Arpeggios in their root form, with inversions at later grades, are quite enough.