Well, I agree, so I would reformulate: I wouldn't recommend people, who do not understand what "rooting" does, to root their phones 
. It is the same as running "sudo su", while not knowing what it does.
. It is the same as running "sudo su", while not knowing what it does.Totally agree with that advice. More people should learn this stuff!
Also, the binary, built from source, is also on github: https://github.com/trezor/webwallet-data/raw/master/android/trezor-app-1.0.1.apk
Brilliant, that's exactly what I was interested in. Presumably this means that there are no Play Store dependencies either (yay). Thank you, thank you, xbach.