There's no way to say this humbly, but imo stuff like this is the reason that companies lose their way when they lose an empowered "buck stops here" product-oriented CEO with enough engineering chops to modulate product decisions.
I had an endless to-do list of improvements, including security enhancements like the one you suggest (but done in a way that would not impair usability, like anything with QR codes :-)).
The problem is, a string of well-meaning but amazingly risk-averse managers came in and killed the soul of the company by introducing enough bureaucracy that the team and I no longer cared to bang our heads against brick walls anymore.
If the leadership doesn't a) understand product, b) understand business, c) know/respect good engineering, or d) have "fuck you, we're doing this" authority ... it will fail in spectacular ways through a series of seemingly good short-term decisions, it's just a matter of time.
Combine product, business, engineering, and authority to lead, sprinkle in some ethics and respect for your customers/employees, and baby you've got a stew going.
This whole privacy mess in home & so-called "IoT" is a result of people who don't even know what would be required to operate ethically with such powerful technology in the first place. I believe they are mostly good people, they just don't have the mindset or philosophy to know what to do. It kinda makes me misty-eyed. They know where to find me if it sounds like some of this could help... I'd be happy to try and get the band back together again.