You are convoluting terms... no such thing as *federated satoshis* it is a receipt for a set amount of satoshis from a federation. Of course the problem with federations, side chains, drive chains, space chains, ect. Is always the pegging out back to actual satoshis. You are trusting entities to perform a function on your behalf in a timely manner. The only way that works is inside the same entity... I have zero trust for anyone who is not me. To my eyes the cost of introducing new counterparties and the complexity of fedimints is not worth the miniscule cost savings.