In my opinion this camera is a revolution, just like the iPhone was a revolution in the phones market.
In terms of design, this is a radical change or, if you prefer it, a clever turn of the screw.
Leica has suppressed all unnecessary physical controls.
It does not make any sense the interaction of a physical button or wheel with a passive screen (play, delete, set, iso... ok, up, down, right, left... and so on), when you can do the same on an active screen. More simple, more elegant, better interface. And Leica did this very well (responsive, elegant).
Leica keeps two direct controls in the T, two wheels, the same controls you had in the M and S (aperture and exposure time). In aperture priority you can transfer a different function to one of these wheels (or not).
This is ultra minimalism, but meaningful minimalism. And we will see other cameras with this same philosophy, by Leica and other manufacturers. This is the interface of the future and I would like to see this implemented on a M camera.
Leica has been the first in going so far. It is incredible Sony or Samsung did not see this. But they did not. It was Leica.
Leica's designers should be proud of this seminal innovation.