Procrustes Stretched
"intuition and imagination and intelligence"
A preamble is a general outline of what the document is about. Since it is a legal document, anything it empowers is laid out in articles. Since general welfare is debatable, then we are obliged to amend the constitution to specify, in articles, any new powers.
To me "General welfare" means something similar to general protection, and making laws that keep the citizens safe.
"...establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare..."
Then the preamble would be full of redundancies.
gawd, pay attention to what you read and then what you post.