This is also my first time writing it all down so I might be missing parts of my thoughts. Like I just realized I'm pretty sure the point of having keypairs cycle based on seeds was to let partial chunks of the network operate in isolation e.g. your home server saying "leave verifying these keys up to me and those I transact with" and then staying connected to the network constantly cycling all its seeds without transaction fees and without the network knowing which ones are for new transactions and which ones aren't.