Needless to say, it's the subject that dictates the tool. A rangefinder / viewfinder camera is usually inappropriate for landscape work, yet used by many. Photographers who use the Mamiya 7II or Fuji 617 may disagree.
For landscape and nature a camera with a groundglass (view or SLR) has its advantages. For documentary shooting the rangefinder. Horses for courses, as the British say. If ones budget and range of photographic interests allow then a mix of cameras is what's needed.
As for "masterpieces", here's my take. I do photography because it's what drives me. I do it for my own purposes; for my own creative satisfaction. Then, like most artists, I enjoy sharing my work with others. Accodales are welcome, but so is critisism. We learn from our failures.
Lables such as "masterpiece" are external to the process of creating art. They're arbitrary and subjective, not to mention fleeting in most cases.
My own judgement of my work is that of the hundreds of thousands of iimages that I've taken over the years, the hundreds that have appeared in print in books, magazines, exhibits and portfolios, about a dozen are ones that I think will last. By this I mean that they may end up being recognized by others as having made a small contribution. At least to my eyes.