Trezor vs Ledger vs Keystone discussion

Thanks @Shawn for making a separate thread. This title gives the impression that it’s about comparing devices, but I don’t think this is what this thread is about. We know Ledger can’t be trusted and we know Keystone is awesome as far as we can tell for the little time we have used it. To me, this is really about figuring out what is the way forward with Trezor.

Thanks also for finding the very relevant post regarding the implementation of shielded transactions on that device, I’ve learned a few things and was reminded of others.

On first point, does anyone knows the exact meaning? What is “anything else”? Trezor is offering two firmwares, a “Bitcoin-only firmware (a lightweight version supporting only BTC accounts)” and a “full-featured Universal firmware (supporting all coins and tokens)”. Is “anything else” maybe implying “all coins and tokens”, and if so would it be technically possible to have a Zcash only Trezor, in a way that would solve the current blocking issue?

Should it be possible, it would probably be interesting to clarify the second point: “Prioritized activities” may be over now, also maybe some of this development could be outsourced. Finally, the third point the does seems to apply anymore.

Is there anything else that is relevant to know about the current situation?

Finally,

It would certainly be interesting to have a working proof of concept of this.