Sometimes

Only to send a simplex invite...

I do on primal. But I never know if they work fully. If they reply, they are working, but if they don’t reply, they may not be working and they may be working.

Yes, they're especially useful in combination with nostr:nprofile1qqs9ajjs5p904ml92evlkayppdpx2n3zdrq6ejnw2wqphxrzmd62swspz4mhxue69uhk2er9dchxummnw3ezumrpdejqzrthwden5te0dehhxtnvdakqn96kcz

I've had to learn to use DMs again, after learning not to use them on other platforms like X-Twitter.

They are the "edge" of Nostr features. Immediately used to move to something that functions reliably.

No

I've tried. Don't understand them. They seem public

I use Nostr DM's a lot, actually.

I do.

Daily. But NIP17 only