I've looked at unsealed records provided by the Signal Foundation, and they definitely have the account creation and last accessed date... But besides that, is there really any information authorities can glean from this? Or is it simply the issue that this leaves users at square one, if they're trying to avoid connecting an identity (be it phone, or Google, which generally requires a phone) to it?

For me, I see this as a potential boon for simply having a second account without having to go through the rigmarole of maintaining an extra SIM card.