Why did Immanuel Kant regard logic as nearly complete?

Immanuel Kant regarded logic as a "virtually completed" discipline because he believed that, since the time of Aristotle, the fundamental rules and formal structure of logic had been established and exhausted.12

In his Critique of Pure Reason, Kant viewed logic as a finished artifice, showing little interest in the development of symbolic or mathematical logic that other thinkers, such as Gottfried Wilhelm Leibniz, had pursued. Because Kant focused on the formal, categorical structure of thought as it had been traditionally taught in university handbooks of his time, he did not perceive the need for—or the possibility of—further significant advancements in the field of formal logic. Consequently, he considered the work of logicians following Aristotle to be largely a matter of technical refinement rather than the discovery of new, foundational logical principles.123