In photography, three factors are defining the outcome: (1) the aperture, (2) shutter speed, and (3) sensitivity.
Leica T controls (1) and (2) directly via knobs (same as a Pentax DSLR), and (3) is floating ISO, found as a preset in today's cameras, but was impossible in film era. With today's sensors, controlling of sensitivity for majority of consumer photography is almost eliminated in everyday circumstances, because of the superb sensor tech.
Multisegment metering, TTL and AF are also superb nowadays when compared to only 10 years ago. I mean, incredible sensors and incredible tech are given for granted, but cameras still look and operate like 30-60 years ago? When I look at today's Fujifilm's cameras, I get a heart attack!
Therefore Leica T needed no extra stuff anywhere because two knobs control all that must be controlled. It uses modern sensors, metering, AF, white balance, modern optics, etc. If one really needs something extra to control, it is quickly available from very large menus. Also menus can be customised, so that only those users really wants are on the screen! (no need to dive through same but endless menus over and over again!)
But look at the Japanese consumer cameras — they are just scaled down versions of large complicated cameras. And even such small cameras, still demand an SD card to operate, and the software is abysmal; horizontal menu driven via buttons, while buttons are so tiny that hardly can be pressed! I mean, what the …
And take a closer look, please —
that entire camera segment suffers now, and is overrun by the smartphones.
I wonder why!
---------- Post added 05-23-2017 at 10:57 PM ----------
My old driving instructor always said,
both hands should be on the steering wheel at all times, and in correct position. So no knobs either — everything is distraction when driving, even some music a person in the passenger seat may change or play for us. And as for passengers, seat belts should also go across their mouths.
I would not say knobs and dials are ideal for
serious photographic tool;
they are only necessary for a very complicated and very heavy photographic tool. Pentax DSLRs are good imaging devices, but they are the most complicated and feature rich cameras in business, and generally are not light. And that is even with basic video features; I wonder how more complicated they will get with more advanced video! Most of those features are not essential; they are bonuses. But there are so many of them, that they beg for a complicated layout of hard controls to use them well.
On the other hand, seriousness is not dictated by the level of operating richness, but by the use of crucial imaging features that allow great results despite lack of bonuses.
As previously stated, photography directly depends only on (1) aperture, (2) shutter speed and (3) sensitivity, and if the control of those three is easy, camera can be quite simple and yet very serious too. It is serious if the components used to control these three, the quality of the sensor, the quality of optics, the quality of material, and the quality of digital data transfer/manipulation are serious.
In addition, heavy cameras benefit from more buttons and knobs because in order to hold such a camera and lens, and still use its features, fingers can move only so little. Lighter cameras like Leica T benefit from a less complicated approach, but lighter cameras can be very, very serious.