This is how I would approach the question.
Also, I am irrationally risk-averse when it comes to losing Bitcoin (I said irrationally!) so I would further lower that threshold.
Some bad feeling likely remains with a device that showed signs of unreliability. A one-time bad day I would brush off, kind of.
You are both correct. And since I have been asked the question a lot, about why I keep trusting the device and why I still use it, I want to make something clear.
1. I can read and understand C, so I feel confident reading the code. Which is important for me.
2. My usage is pretty limited. Once a month, I scan a private key QR code, I sign a transaction (usually a pretty small one), I erase the memory of the device (using temporary signer option).
3. Blockstream doesn't know my address, nor my name, since I received the product elsewhere, where I don't have the ability to access now, so if I request a change, or buy a new one, I will need to use my real name and address.
4. I own other devices that I use for more frequent transactions.
5. I always know that my backups are safe.
6. I always use QR codes, which is safer than USB cables. Still, QR codes are not a panacea, but, you know, I feel more confident.
7. The Jade is a reputable device.
Warning:
Finally, always be very cautious when it comes to using browser-based products (software & updates). Always verify what you download. Always think twice before downloading something.
