Madison ,Federalist #40
"The truth is, that the great principles of the Constitution proposed by the convention may be considered less as absolutely new, than as the expansion of principles which are found in the Articles of Confederation" The Constitution was supposed to simply be an extension of the Virginia Compact and the Annapolis Convention which were primarily designed to promote free trade among the states.
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Articles worked well which is why most supported it. It won the Revolution and secured a
peace treaty with land all the way to Mississipi, state govts were established, voting franchise greatly extended, freguent elections, separation of church and state, beginning of abilition of slavery in northern states, expansion of education and literacy, establishment of State Bills of Rights, patterns of expansion with NW Ordinances established, ( all westen land to Fed was to be divideded and sold for $1 per acre, self rule, and admission to union when population was 60,000, freedom of worship, trial by jury, no slavery, trade opened with Europe and Asia, loans secured to US from foreign powers.
Additionally, many did not even attend Constitutional convention like Jefferson Adams Henry, and only 33 of 59 who did attend signed it.