(Sorry if this is a newbie question, but I'm not a Unix person and I've never used SSH.)

assuming I don't plan to modify anything in the TP2 OS,
is there a good reason to boot from internal SSD instead of internal Flash?
Will the whole system be more stable or work faster?

BTW, why don't you include a command in the admin panel, to make internal SATA drive bootable?

There is no need to boot from the SSD if you have no plans to modify your plug's OS etc.
Booting from the SSD basically allows you to modify the OS etc without worrying about bricking your device.

We will consider making a USB drive as a bootable disk as a feature request.