The subassemblies refer to both geographic and functional councils. It allows the bypassing of an implacable group, but retains the idea of extraordinary procedures. The word quotas suggests the possibility of proportional representation, functional constitutencies, pluralities, etc., or combinations of them. Both groups are old enough to be responsible, while being negligibly less intelligent. The Assembly elects the President, another reason for the single term, so that the President won't control the Assembly.
Separation of powers is provided elsewhere.
What's destroyed the separation of powers is provided elsewhere. Most people are naturally unrepublican and have to be forced to listen to others. The Supreme Court is limited in its political role and chosen by lot. Note the new function given the Court. This would be largely a veto power.