#nostr dm's have a long way to go. My inboxes on Amethyst and noStrudel are completely different to an extend that some messages don't even appear in one app but in the other (no it's not relays cause I use the same relays on both apps)
Discussion
Until there's a new implementation of DMs, it is to be avoided because they reveal meta data that could be used to figure out your nsec (if you chat enough times).