" In absence of a secondary differentiation criteria,"
I was addressing the concern of the PP who mentioned immigration being dominated by a few populous countries in absence of country caps. Ideally the immigration system should be revamped bottom up to include a point based system which gives points to educational qualifications as well as familial ties.
The current political climate leaves that option out of the window. Hence at least removing country caps from employment based immigration (which is 14% of the total annual quota) is a reasonable common sense fix.