The whole point of signal is that they cannot provide you with your data - they do not store it.
Further, I have been frustrated with similar design decisions with Signal - but how can they ensure you can export your messages without allowing letter agencies to do the same? Falling back on platform security guarantees is a rather good choice in terms of the economics - Signal need not gatekeep access to their private data - it is android and iOS that do the heavy lifting there. I’d love to move my messages between devices and sims - but I understand why that is not feasible for now.
Further, I have been frustrated with similar design decisions with Signal - but how can they ensure you can export your messages without allowing letter agencies to do the same? Falling back on platform security guarantees is a rather good choice in terms of the economics - Signal need not gatekeep access to their private data - it is android and iOS that do the heavy lifting there. I’d love to move my messages between devices and sims - but I understand why that is not feasible for now.