This one depends from the launcher application. On the ST10+ the default storage for log files is in the SD card. Using the controller without the SD remove the waranty obligations from the manufacturer.
Probably for ST16 is possible to remap the memory point, but I didn't test this, because this is useles for me. The ST16 gives full access via ADB and access to the storage points when the device is connected via MTP.
Why? What is this good for? It is not recommended to have a SD card in the ST16 during flight. The slot is only to preview videos from the camera SD card in the field and for FW updates, nothing else.
Another Anroid FW will make the ST16 useless as RC for the drone.
I never heard about that recommandation. Could you please elaborate on the background? I hope the answer will not be RTFM ;-)
Does the active slot occupation diminish system performance? Just wondering why...
I haven't seen it mentioned anywhere but perhaps there is a reason.
I often keep a blank card in the ST as a spare. It's just a convenient way to carry it. But it's formatted as ExFAT so the controller can't read the card anyway.
Just tested on the simulator. In the real-life should be the same. When tapping on some of the buttons on the lowest part of the screen, the message pops with precaution and OK or Cancel choices. The controller is still operable and the copter is under control. If I tap OK, the copter goes in the RTH mode. When I go back to the launcher, the copter is under control again.
The pad is necessary for telemetry and camera presentation. On the start-up stage, it initializes the FC (Yes, in the ST16 FC has a place). Further using is the manufacturer's decision, which is not related to the controls.