The usual reply to "nobody answers what for" is that constitutions already do. Ireland wrote that reply in 1937 and then locked it.
Article 45 of the Irish Constitution is titled "Directive Principles of Social Policy." It tells the State to promote the welfare of the whole people, an adequate livelihood, and a distribution of resources for the common good. The first paragraph is the machine: those principles "are intended for the general guidance of the Oireachtas. The application of those principles in the making of laws shall be the care of the Oireachtas exclusively, and shall not be cognisable by any Court under any of the provisions of this Constitution."
India copied the idea into Part IV. Article 37 says the Directive Principles of State Policy "shall not be enforceable by any court" but are "nevertheless fundamental in the governance of the country." Different lock. Irish courts cannot even take cognisance. Indian courts cannot enforce, but they can read other law through the principles.
Then India tried to rank the purpose layer. Section 4 of the 42nd Amendment (1976) extended Article 31C so that a law giving effect to any Directive Principle could not be struck for violating Articles 14 or 19. Minerva Mills Ltd. v. Union of India, AIR 1980 SC 1789, 4–1, Chandrachud C.J.: "The Indian Constitution is founded on the bedrock of the balance between Parts III and IV. To give absolute primacy to one over the other is to disturb the harmony of the Constitution." Harmony, not a ranked object for the whole system. Purpose did not get to eat rights.
So the specimen is not "a preamble contains nouns." It is a written what-for designed not to compose with the rights-and-rules machine, and a later attempt to make it compose that a court refused.
Competing design, and it is older than Ireland.
Jacobson v. Massachusetts, 197 U.S. 11 (1905), Harlan J.: the Preamble "indicates the general purposes for which the people ordained and established the Constitution" and "has never been regarded as the source of any substantive power conferred on the Government of the United States or on any of its Departments." Union, justice, tranquillity, defence, general Welfare, Blessings of Liberty — listed, then denied as a power.
The EU did the same split in public. TEU Article 3 is a purpose clause: peace, values, well-being of its peoples, internal market, social market economy, full employment, the euro. Article 3(6) then says the Union pursues those aims "by appropriate means commensurate with the competences which are conferred upon it in the Treaties." Article 5(2): under conferral, the Union "shall act only within the limits of the competences conferred upon it by the Member States in the Treaties to attain the objectives set out therein."
Aims are listed. Power still comes from the competence list, not from the aims.
The essay wants a combined-system object you can be measured against, with challenge and a leftover closed in public. Jacobson and conferral predict the opposite repair: if a what-for starts to bind, you have left governance-by-rules. Discriminator: take a statute that sits inside enumerated powers or conferred competences and that clearly fails a published composite objective. Does anyone have authority to kill it for the failure, or only for exceeding the power grant? If only the grant, these constitutions are not missing a layer. They refused it.