In addition you can split manually a seed into shares without using complex procedures, if you need a kind of SSS scheme to dispatch it in several places (without checksum though).
that would literally be like a terrible idea.
I don't think it's terrible, because it will always stay as stronger as copying the initial seed, at least. So it doesn't weaken the seed, if you need to duplicate it.
The iancoleman page is offering this feature, and for a 2 of 3 split of a 24 words seed, it seems to remain very hard to break according to his calculations.
https://iancoleman.io/bip39/So doing all this work manually doesn't seem to be very useful at the end, I don't see any real use case requiring it at least.
that's why they're asking people to email them if they know how to include those functionalities. just because you use a computer at some point to fund the wallet doesn't mean the entire scheme doesn't have a purpose. the title of the video should give you a hint though: MIT Bitcoin Expo 2022: Breaking Through - Long Term Trust and Analog Computers, Andrew Poelstra
That's why I weighed my words by saying it "
doesn't seem" to be "
very" useful, and by adding that "
I don't see" any real use case "
at least".
The obvious one is when you receive, inherit or find a seed while you have no access to a trustable device because you are in an isolated place (a boat, a jail, a place without electricity, ...) or because you are too poor to buy one. But apart from that one, I don't think there are many other use cases in real life to be honest.
