One reason could be that Leica doesn't develop mainstream products.
Sometimes they do not look great on paper but do work pretty well.
The user interface of the T is a good example. First you think it is a camera for smartphone lovers. But I experienced that the simple and straight forward user interface works quite well also for people who do normally like analog user interfaces.
Another thing might be lenses, sometimes they look slow compared to competition, but then the lenses are desgined that you can really use all f-stops, even wide open. Vs some other brands where lenses are faster but with inconsistent quality.
One thing I don't like is Leica Marketing...IMO they focus too much on the exclusivity factor.
In case of the T they should have optimized the firmware before starting to sell the camera IMO.
Anyways, I am glad the camera is so fast now and I use it a lot.