I think one of the things that makes people react to Leibniz in the way that Diderot did is the sheer breadth of his accomplishments. Setting aside his achievements in any particular field, Leibniz is clearly one of the greatest polymaths the world has ever seen. He is well-known as an important philosopher, mathematician, and natural philosopher and, to a lesser degree for his pioneering writings on jurisprudence, linguistics, and geology. But also his work extended to more practical endeavours as, including inventions such as his early calculating machine, his designs for wind driven water pumps for use in mining, and a submarine. In one letter he even mentions an idea for shoes with springs underneath to facilitate quick escape from pursuers.
Continuing the End Times series, Richard Marshall interviews Paul Lodge.