You’re just dodging my question.
What benefit does open source truly have to an HWW?
It’s a black box you can’t really inspect and anything it tells you about the code it is running is “trust me bro”.
For all you know there is a segment of the firmware not overwritten by the update process that tampers with the code to steal your keys.
Of course, having open source code would be good for security auditing, but it doesn’t prevent any actual malicious code. And there’s some vendors that just can’t due to NDAs.