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Cool, excited to read it! Thanks for the link. Any plans for open-sourcing hardware, too?
We are inclined towards open sourcing that too. We just don't have a timeline for that at this point.If you are optimising for convenience, you can store an X1 wallet and X1 card together.
That doesn't sound too bad, yes.Onramp is optional for the users to use. We will definitely keep this in mind before we decide to go ahead with the integration.
If the exchange feature is not integrated yet, maybe consider integrating Bisq or Robosats instead (if technically possible). Or skip it; honestly, anyone setting up a multisig solution like this, doesn't need an exchange embedded in the wallet software.But the same thing could be argued for a bug in the bootloader and secure element of some of the most popular hardware wallets since even they are not upgradeable. With Cypherock, at least your funds are not at risk since the private keys as a whole are never stored completely in the Javacards.
That's true; but you can fix bugs outside of bootloader / secure element, while on this card you can't fix any bug. 
I get your point, though. Distributing keys solves a lot of theoretical issues in the real world, if properly deployed.We know it is hard to quantify the security.
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Given decent geographical distribution of the cards, we may even argue that the security delta might be even higher. We considered an average here. I would say the security delta is even greater for Bitcoin multisig.
I'd go as far as saying that it's impossible to quantify. So I'd personally just skip such numbers altogether, but it's just a suggestion. To anyone who knows that it's not quantifiable, it simply looks bad / amateurish. Your wallet looks rather good without that; if you leave out KYC integrations and make sure it can work with other wallets (no vendor lock-in), it can be a very decent and successful device. Open-source hardware would be a giant cherry on top.[...]
Given decent geographical distribution of the cards, we may even argue that the security delta might be even higher. We considered an average here. I would say the security delta is even greater for Bitcoin multisig.