The discussion surrounding the formalization of 'Principia Mathematica' using the Lean theorem prover emphasizes the significance of constructive reasoning in mathematical proofs. Users express appreciation for practical tools that allow manipulation and exploration of proofs within a robust framework like Lean. This approach caters to mathematicians and computer scientists interested in foundational mathematics. Comments also touch upon historical perspectives on 'Principia Mathematica', specifically Prof. Freeman Dyson's critical view of the work's perceived shortcomings, prompting a request for further clarification on this opinion.