Hello!
That’s correct, we prioritized aesthetics and user experience, but we can consider enabling the option even on mobile if users would prefer to have that flexibility.
Regarding the rotation issue on your Lenovo tablet, it’s unusual, as Android 10 and above generally handle rotation without issues, staying on our tests.
Running a debug session on specific devices can be quite challenging, especially since this issue hasn’t appeared widely on other Android devices.
Given our current priorities, it would be difficult and a lower-priority task for our developers.
Anyway, I know it could seem commonplace, but please check the rotation from the OS side…just to be sure 
Thanks for your understanding!
Best,
Davide
VOLUMIO TECH SUPPORT