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While TMKMS-backed transaction signer support sounds great in theory, this feature implements the pre-Protobuf transaction format (Amino) which is no longer commonly in use on Cosmos chains.
It also uses a bespoke JSON RPC, whereas a more modern implementation would use gRPC.
It comes with a fairly high maintenance burden in that it has a number of cryptographic dependencies transitively via the now defunct
stdtx
crate.