He was the bright star amongst Japanese, mostly unknown (but also great) camera and optical designers who made Japans camera industry rule the world. In contradiction to famous engineers who designed great cameras almost nobody wanted to buy, or could effort to buy, and ruined camera companies - in Germany.
Maitani's output made Olympus a well reputated and successfull operating, big camera company.
From all the cameras he designed his photographical roots can be seen: That he learned photographing with the Leica IIIa of his father. He still believed in small and simple cameras even when Leica left this way - and was proved right by the market. His Four thirds was a better choice than Two thirds: That's why it's still alive today. Moreover, Maitanis cheap halfframe cameras kicked famous Voigtländer out of camera market and proved them wrong: it depends on the camera, and more than one company can build good lenses.
The Pen F camera series continues to be an intelligent and challanging camera system, which is also true for the OM system.
For me, Yoshishisma Maitani was the true successor of Oskar Barnack - which means: he developed and changed things, not kept them the same.
Surely he was the last one of the "big names", legendary engineers and designers. A pity that in the modern camera market there is no place for outstanding persons anymore.
As long as photographers and collectors love the sleek lines of a Pen-F or OM camera and keep using them his creator is still alive.