I'm ready to buy ColdCard just for this feature, however I'd like to verify the implementation by seeing the same results on a device made by a different manufacturer.
Interesting feature. Probably useful in a company enviroment or for specific projects.
For personal use I don't know if I want to have an unique master seed and mix all my seeds (real, testing, temporary, etc wallets) under a unique key. Without a note attached to the single seeds could be confusional retriving the correct one only by the index. Ok, you can have an "index - note" list elsewhere :)
Finally you put all the eggs in one basket, if you leak this master seed you are in troubles...
But if you need to generate a lot of seeds keeping an offline backup for all of them can actually be a real problem, that BIP85 solves.
good for uncle jim setups. i have this for two family members who use hardware wallets and will most certainly lose their backup but i don't want their seeds in my possession. i know i could derive them if needed again
Yes, you'd need a note to explain the use of the additional generated seeds. But this doesn't have to be encrypted, and could be part of your estate planning.