> Open source code and device schematics shouldn't be a significant security threat.
You don't see how a completely open device could be insecure?
> As for the second point, I should be able to install whatever software I want on my device...as its mine.
This is a valid opinion, but the whole point of contention is whether you can do anything with a device simply because you've purchased it, as opposed to what has been exposed for you to do.
No an open device does not automatically mean insecure.
Proper security controls should work even if the schematics are open. If they don’t, that is a security defect whose ownership falls under the manufacturer.
You don't see how a completely open device could be insecure?
> As for the second point, I should be able to install whatever software I want on my device...as its mine.
This is a valid opinion, but the whole point of contention is whether you can do anything with a device simply because you've purchased it, as opposed to what has been exposed for you to do.