You were the one that took us into the twilight zone by repeatedly holding up Magnum members as examples of great Leica photographers. Turns out Magnum photographers use all different type of equipment, so it is clearly not the camera that make the difference.
It's just a pointer into why one might choose to use a Leica over another type or brand of camera that might not have to do with the all too well known reason of brand vanity.
This can be a circular argument all the live long day but the fact remains that Leica built its reputation on the quality of the workmanship and optical designs that surround their brand.
With the help of talented photographers over the years choosing to make their mark with this equipment, that only served to solidify their deeply etched niche in the history of photography.
Trying to circumnavigate the fact that a lot of brilliant image makers chose Leica is just silly. Sure...they could have done and do make fine images with other brands and types of camers. But the simple fact remains, they chose Leica for very specific reasons.