1 - What’s the reason behind the choice to support just a few of Audio Interfaces? Hardware compatibility or marketing?
as I said before my Focusrite Scarlett 2i4 works fine with cubasis LE…it’s just that it’s not in “the” list of the supported devices then Cubasis LE goes in demo mode…
Cubasis LE comes bundled with a wide range of selected audio devices from Yamaha, Steinberg, Line 6 and lots of devices from other 3rd party manufacturers, as listed here: https://www.steinberg.net/en/products/mobile_apps/cubasis_le/compatible_hardware.html
Once a compatible device from the list is connected/detected, Cubasis LE automatically unlocks from demo mode.
2 - Does Cubasis full edition require supported hardware devices as well?
Cubasis supports iOS compatible hardware devices, but can also run on its own.
Same goes for Cubasis LE, once unlocked via compatible hardware.
3 - Does cubasis full edition allow to route my audio inputs in this way? Input 1 --> mono output (Left) - Input 2 --> mono output (right)
Depending on the connected hardware, Cubasis allows to assign MIDI and audio tracks to up to 24 individual outputs (12 stereo pairs) simultaneously.